Well two-stage heat pumps run more often, while using less energy. You can find out more about our use, change your default settings, and withdraw your consent at any time with effect for the future by visiting Cookies Settings, which can also be found in the footer of the site. Cool mode is primarily used to avoid overheating in the summer, fall, and spring. Use this guides simple home lighting updates to boost, Smart home systems can cost anywhere from a few hundred dollars to over a hundred thousand. Heating SA means "Sexual Assault" and "Sibling Alert." Here is more information about each of these definitions of SA. slightly. The display has low contrast when heating is on. See Temperature Display Adjustment in the Configuration Menu section. For the RC, it powers the cooling system. We know 500 definitions for SA abbreviation or acronym in 8 categories. What is Stage 1 and Stage 2 on a heat pump? If your programmable thermostat is not adhering to the normal schedule by making temperature changes throughout the day as you have it set, its time to troubleshoot. Heating system requires service or thermostat requires replacement. Because it takes some time for the When the strip is hotter, it bends and breaks the circuit, so no electricity can flow. (In a simple heating-only cir. Most experts recommend setting your thermostat to 78 degrees Fahrenheit in the summer months. When the temperature inside your home drops a certain amount below the goal temperature (usually 1.5-2 degrees), your thermostat energizes auxiliary heat. Some AC technicians suggested users install a double booster voltage stabilizer to solve such problems. This cookie is set by GDPR Cookie Consent plugin. Use the additional wires for a humidifier, an outdoor temperature sensor or a fresh air ventilator. 1 What does Stage 1 and 2 mean on my thermostat? Fear not, the robot revolution has not infiltrated your home. Some people also like that the fan provides a little background noise, helping them to sleep. Since your air will get pulled through the filter with each cycle, Fan mode can help remove debris and odors. So it seemed the standard adopted by many manufacturers was N/O for heating and N/C for cooling. In some thermostats, this mode is also called Auto mode. The inner disc pushes against a microswitch in the middle of the thermostat turning the electric It'll probably stay in the mode for about 3-5 minutes and then start . 2-stage conventional cooling will have wires leading into the Y1 and Y2 terminals. A spring (not shown here) pulls the whole mechanism back again as the temperature falls. E8 indicates that there is a problem with the exterior discharge sensor. Can I use a Nest Thermostat with only 2 wires? Once the thermostat reaches the desired temperature, the entire system shuts off until the next cycle.When the set point is . G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat. This is done by programming the thermostat not scheduling the times and temperatures of a day schedule but actually programming how you want the thermostat to react to your specific system. It can run at a lower or a higher speed depending on the temperature changes in the home. Eventually, it bends so much that it breaks open the circuit. Sort. Restart the machine until the P1 symbol disappears. Semen Analysis. Many thermostats use the same principle, but the strip is usually just a short length of two metals. 1st stage is more efficient than 2nd stage, but systems are designed to use both stages, so no worries there. Press the menu button (button will disappear) and hold in for 20 seconds. Your thermostat may also have extra terminals that don't apply to your particular HVAC system. The unit works really hard to run and provide cool air inside the home. It works similar to heat, but instead of running the heater, this mode runs the air conditioner. The old bi-metal strip thermostat still had contacts marked N/O and N/C but there was no normal all depended if summer or winter and the setting on thermostat as to which contact would be made as you removed it from the box. The unit could be running low and need additional refrigerant added. We'd be able to know for sure with the correct model number, but assuming all Honeywell thermostats follow the same icon structure then this indicates that the Smart Response technology is off. Its a maintenance reminder that you should have your system inspected and cleaned to keep it running efficiently. If your in the San Diego, CA area and want help with newer technologies like a Smart Thermostat, we got your covered! Do you want the Cycle Rate to be Fast or Slow? If your thermostat keeps resetting itself, the chances are that it is either needs to be reprogrammed, has bad batteries, bad wiring, or a bad fuse. How do you apologize for being too drunk? Articles from this website are registered at the US Copyright Office. This blog will help you decipher what your thermostat is trying to tell you so you can determine the next course of action! Off mode can also be helpful for temporarily turning off the HVAC to save power when you leave the house. Possibility of a bad contact. However, the HVAC system itself will be turned off. This is a one-touch button to put the thermostat into its energy saving Away mode. Consult the instructions on the new thermostat to determine which connections need to be made. electricity flow again, so the heating switches back on. The average system relies on you, the owner, to understand its coded language and give it a regular maintenance check to avoid future hassles. The discs have a large surface area so they react quickly to heat and they're corrugated All Rights Reserved. Code P1 indicates the bottom tray is full. 1 System On indicates when heating or cooling stage is energized. Photo: Here's the inside of a mixer shower control, showing what a wax thermostat actually looks like. Furnace (Air Conditioner) Cycles Too Fast or Too Slow (narrow or wide temperature swing). To make it simpler, you may want to label the wires with small tabs of masking tape before disconnecting the old thermostat. Some thermostats may use other names for off, such as manual. showing only Military and Government definitions ( show all 279 definitions) Note: We have 222 other definitions for SA in our Acronym Attic. An LCD display shows indoor unit status, room temperature, clock, and error codes. What is the formula for calculating solute potential? Photo: A typical smartphone app linked to a home thermostat. Your service technician or installer should set this reminder according to your existing maintenance plan. The display light is called dL. Some codes are basic reminders while others require an immediate response. We also use third-party cookies that help us analyze and understand how you use this website. As the engine's coolant warms up, the increase in heat causes the wax to melt and expand. Why does my nest say heating in 2+ hours? with the Truth! However, you may visit "Cookie Settings" to provide a controlled consent. Privacy Policy. It is only used in situations where the thermostat has a humidity monitoring system. control the heating system but, although Thermostat definition, a device, including a relay actuated by thermal conduction or convection, that functions to establish and maintain a desired temperature automatically or signals a change in temperature for manual adjustment. don't react quickly to temperature changes. The air coming out of your vents should be roughly equal throughout your whole house. But not all UV bulbs are created equal. Was this article helpful? This cookie is set by GDPR Cookie Consent plugin. Author of the blog (work in a car repair shop) Created: 2022-09-05 17:27:12. The second stage is the full capacity of your system. Thermostat thermometer setting requires adjustment. Wax thermostats are probably the most common exampleand you'll find them in home radiator valves, car engines and mixer showers. The cycle delay means the heating/cooling cycle of the thermostat is getting delayed for one or more reasons. Honeywell digital thermostats are capable of handling the simplest and most complex heating and cooling systems. A programmable thermostat allows you to adjust when the heating or air conditioning in your home turns on according to a preset schedule you determine. If you love your programmable thermostat and want to take your home to the next level, consider a smart thermostat from Four Seasons. The cookie is used to store the user consent for the cookies in the category "Performance". 1. control the temperature with a thermostat The display turns off a few minutes and then turns on again. About Coupled with room This one is marked in degrees Celsius. It allows to conduct timely diagnostics of an appliance and remove defects. Everyone has their own preferred temperature for the Heat mode. A two-stage furnace fires up the first-stage burner and in most conditions stops there. Off is a fairly self-explanatory mode, since it shuts your HVAC system off. You tell the thermostat what temperature you want to keep your house warmer than and which temperature you want to keep your home cooler than. It is always best to refer to the guide specific to your thermostat. With so many different thermostat manufacturers on the market today, Honeywell is a name you can trust. By adjusting change in state of a substance from liquid to gas. "System On +2" indicates when a second stage is energized. If an acceptable cycle rate is not achieved, contact a local HVAC service person for additional suggestions. For example, if your system is broken and running it will cause further damage, you would want to use the off mode to shut it down. We recommend checking your thermostat model by identifying the model number. Unlike other modes, Eco mode does not ask you to pick a specific temperature. The Honeywell digital thermostat RTH8500 series can handle most HVAC systems. With these thermostats, you can leave the fan running all the time, but your air conditioner or heater will still kick on if it is too hot or too cold. offers great, flexible Club Membership that suit your schedule and budget! thermostats, valves like these can stop your home from overheatingand that's a good way circuit switches on and off. Something can trigger this short cycle two ways. Probably the most crucial setting on your entire thermostat is the temperature setting. Let's just be clear about the difference: a thermometer is something that measures the temperature; a thermostat is something that tries to maintain the temperature (keep it roughly the same). You can turn the dial to adjust your expected time away between 1 and 8 hours; if you do not, the thermostat will default to your most recent duration Away and enter away mode. when our home is too cold, the thermostat switches on the heating so The thermostat that is used to control the heating and cooling (HVAC) system in your home is a low-voltage device that is easy enough to replace. Once youve learned how to set your energy-saving thermostat and use the run and hold button appropriately, youll be good to go to save money, set your desired temperatures, and take the stress off your HVAC system. Y is for cooling. RC: The RC terminal is the 24-volt cooling power supply. Thermostats have a wax filled copper housing or cup called a "heat motor" that pushes the thermostat open against spring pressure. 2 The word HOLD is displayed when the thermostat is in the HOLD mode. In normal operating conditions, the thermostat housing can reach nearly 40?C at maximum load. So bitmetallic thermostats rely on the expansion of metals as they get hotter, while gas bellows work using the expansion of gases. G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat. Is it broken? The displayed ambient temperature is incorrect. So if the house doesnt reach the set temperature within 10 minutes, the timer automatically fires up the second stage. Run an additional 18-5 thermostat cable up to the new two-stage thermostat. Get daily tips and tricks for making your best home. metal strip to expand and contract, the heating isn't constantly Most systems operate at one stage. A digital thermostat can be overwhelming to those who are used to the old, round mercury thermostats. Save my name, email, and website in this browser for the next time I comment. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. switching on and off every few seconds, which would be pointless (and document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); 2023 Friar's Heating and Air. This unlocks the thermostat. circuit (and the heating) off. Yes No CONTACT US MESSAGE US Message us on Twitter for help with our products. This minimizes temperature swings within your home. Also for: 44150, 44150b. Request Service If you are not sure how to define Thermostat, our website can provide you with the appropriate definition. Retrieved from https://www.explainthatstuff.com/thermostats.html. There is White Rodgers thermostat troubleshooting table below. Awareness, Situational, Safety . For example, your system may explicitly explain the problem by saying Check Blower or No power to Condenser, while some thermostats use numeric codes such as 302 or 1045. If you dont have your thermostat manual handy, these numeric codes can be difficult to translate. Same as diagnostic for No Heat condition except set the thermostat to COOL and lower the setpoint below the room temperature. 1/3 compressor capacity is the 1st stage. A bathroom fan, for example, should be able to pump a minimum of 50 cubic feet of air per minute. The "Comp./M read more (which means standing and is related to words like stasis, status This mode is also convenient because it does not require you to spend a lot of time fiddling with your settings. But opting out of some of these cookies may affect your browsing experience. Most thermostat wires operate on 24-volt power provided by a transformer, and they are generally safe to work on without shutting off the circuit feeding the thermostat wiring. Unlike a heat setting or a cool setting, this setting can use both your HVACs warming and cooling capabilities. Air Conditioning Manufacturers are Lying to You Heres HELP!! It is important to understand how the thermostat communicates with you. How do you clean a silver chain that turned black? G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat. When a code appears on your thermostat, it usually indicates the need for a routine maintenance check. . The most important thing to remember is that the unit should respond to any temperature adjustment even if it displays 88 and all the lights are on. Emily Estep is a plant biologist and journalist who has worked for a variety of online news and media outlets, writing about and editing topics including environmental science and houseplants. And replacing one is a very common project, as homeowners swap out older thermostats requiring manual adjustment with newer programmable thermostats that change temperatures automatically at preset times. Press CTRL + D to bookmark this page for later or tell your friends about it with: Woodford, Chris. If the display is flashing the word EMER it indicates that your thermostat is in Emergency Heat mode and that the Emergency Heat is currently running. Answer (1 of 9): The terminals have letters that refer to functions. Behind the numbers is a winding of wire thin as thread. Replace door panel in proper position to engage safety interlock or door switch. Offers new search. A battery replacement done by a professional can be pretty pricey not to mention easily preventable. Carefully move the unit to a drain location, remove the bottom drain plug and let the water drain away. You'll be wanting to cool down, then. A narrower span means that you will have to adjust the thermostat further away from your desired temp setting. Essentially, the hold setting will enable you to adjust your homes temperature, which is different from the schedule you programmed. Enter a Melbet promo code and get a generous bonus, An Insight into Coupons and a Secret Bonus, Organic Hacks to Tweak Audio Recording for Videos Production, Bring Back Life to Your Graphic Images- Used Best Graphic Design Software, New Google Update and Future of Interstitial Ads. A smart thermostat is a step up from a programmable thermostat, as it typically allows the user to program desired settings and it connects to Wi-Fi for more advanced features and functionality . When the thermostat light (Emergency Heat Light) flashes or turns on during normal operation (whether in cooling or heating mode, but not Emergency Heat mode), it's usually a sign that the outdoor unit is "locked out." When you see the light flashing, a code appears. (Note: The RC and RH terminals are jumpered together in a four-wire heat/cool system and a single-stage heat pump system, but not in a five-wire heating/cooling system.) A leak not only keeps the AC unit from cooling properly, but also it can cause other issues within the home. Just remember that extreme temperatures can damage your home or harm pets, so be cautious about using off. Find the most effective option with our review of the best sealants for, Is your mental or physical well-being suffering from poor lighting in your home? 2. 1. It stands for Ultraviolet. This means that it might be time to replace your Ultraviolet Bulbs that keep your homes air quality clean and healthy. When Low Output mode is insufficient, the furnace will automatically switch to High Output mode in order to maintain your comfort. What does SA mean? That's the problem the latest generation of smart thermostats are designed to solve. The bimetal ("two metal") strip is made of two separate metal strips fastened together: a piece of brass (blue) bolted to a piece of. Key Takeaways. One of the most common reasons why an AC takes longer to cool your home is because of a dirty air filter. Monday through Friday: 9am to 6pm CDT Saturday and Sunday: The Honeywell RTH8500 series has a 405 code indicating that the battery is getting low, and you have a month or so before anything will happen. 1 "System On" indicates when heating or cooling stage is energized. How to Adjust a Thermostat's Heat Anticipator, How to Wire a Line-Voltage Thermostat for a Baseboard Heater, Choosing the Right Thermostat for Your Furnace. Iron expands less than brass as it gets hotter, so the bimetal strip curves inward as the temperature rises. Larry Campbell is an electrical contractor with 36 years of experience in residential and light commercial electrical wiring. Common methods for resetting a thermostat include installing the battery backward for five seconds, pushing a recessed reset button with a pin or paper clip, or shutting off the breaker to the thermostat for 30 seconds. RESULT: No. O is for a heat pump's reversing valve. Select Thermostat configuration. It's the same with the RH wire in that it powers the thermostat. When the radiators heat up to the level you've set, the wax valves expand and It's fine for your system to have long run times when it's cold outside. SA Military Abbreviation. In many cases, your thermostat may be stuck on the hold setting, which will keep your homes current temperature rather than adjust the temperature throughout the day on a schedule. S.A. Situational Awareness + 1. Text copyright Chris Woodford 2008, 2019. No matter what system you have, a Honeywell digital thermostat needs to be told how and what to control. Some plans require annual checks while some require biannual checks. This will also give codes that are specific to your system and Honeywell digital thermostat. Temperature valves fitted to central heating radiators typically use 1/3 compressor capacity is the 1st stage. Your furnace may be blowing cold air because the filter is too dirty. The other potential trigger of this general electric AC code is a failed sensor. Span is the measure of a thermostat's range, and it usually refers to how wide the temperature swing is from cold to hot. How do I know if my furnace is 2 stage? We use cookies to ensure that we give you the best experience on our website. For deeper technical detail, take a look at this selection of thermostat patentsand find hundreds more on Google Patents: Please do NOT copy our articles onto blogs and other websites. Why does my thermostat say system on 2? Heating does not run even if the thermostat indicates it is on. The rising needle switches on or off whatever device the thermostat is controlling. Say the . If the heat works intermittently contact the furnace manufacturer or local HVAC service person for assistance. February 7, 2023. What does RC and RH mean on a thermostat? If you want to get into the Configuration Menu, you have to have the thermostat in heat or A/C. Login . According to this similar thermostat's manual, Smart Response this does the following: Keeps you comfortable . The Nest Thermostat E is only compatible with one stage of heating, one stage of cooling, and an additional stage of either heating or cooling. If the thermostat gets its power from the AC system, it will start a delay process any time electricity goes off. As the strip gets hotter or cooler, the strip gets looser or tighter, moving the pointer (left) up or down a dial to indicate the temperature. What are they and how do they work? When the house is cooler than this temperature, the air conditioner will turn off. What-does.net is your comprehensive online definition dictionary. Furnace Lock-Out Condition. What Is a High-Temperature Limit Switch on a Furnace? Can heat pumps use existing ducts as well? Required fields are marked *. The two most common types use bimetallic strips and gas-filled bellows. Some new thermostats require no more than two wires and will work fine if the extra wires are left unattached. If the room gets too hot, it triggers a wax thermostat that actuates a valve, shutting off the flow of water through the radiator until the temperature falls back down again. Maintenance reminder that you will have wires leading into the Y1 and Y2.... Temperature falls delay process any time electricity goes off unit from cooling properly but. You will have wires leading into the Configuration Menu section you decipher what thermostat! Suit your schedule and budget Smart response this does the following: keeps comfortable! We use cookies to ensure that we give you the best experience on our website can provide you the... To have the thermostat to 78 degrees Fahrenheit in the San Diego, CA area and want with. Extreme temperatures can damage your home from overheatingand that 's a good way circuit what does sa mean on thermostat on off... Water drain away residential and light commercial electrical wiring contact a local service... A short length of two metals a double booster voltage stabilizer to solve, so the bimetal curves... A typical smartphone app linked to a home thermostat be helpful for temporarily off... Determine the next course of action to save power when you leave the house cooler. Many manufacturers was N/O for heating and cooling capabilities unit could be running and. Has a humidity monitoring system that suit your schedule and budget and gas-filled bellows expansion of metals they! O is for a routine maintenance check and contract, the increase in heat or A/C stage! Rate is not achieved, contact a local HVAC service person for assistance best refer! Same as diagnostic for no heat condition except set the thermostat indicates it is always best refer... Where the thermostat gets its power from the schedule you programmed because the filter is Too dirty causes the to! Understand how the thermostat is controlling as diagnostic for no heat condition except set the thermostat is getting for. Them to sleep one or more reasons this website cooling properly, but the strip is usually just what does sa mean on thermostat length... Has not infiltrated your home from overheatingand that 's the inside of a air! Have extra terminals that do n't apply to your existing maintenance plan reminder that should... Have to adjust your homes air quality clean and healthy it seemed the standard adopted by many manufacturers was for. Turned off code appears on your entire thermostat is trying to tell you what does sa mean on thermostat can! Blog ( work in a car repair shop ) Created: 2022-09-05 17:27:12 to those who used... 2 on a heat pump & # x27 ; s reversing valve mechanism again. Adjust your homes temperature, the furnace manufacturer or local HVAC service person for additional suggestions,... A spring ( not shown here ) pulls the whole mechanism back again as the temperature.! Using the expansion of metals as they get hotter, so be cautious about off. Blog will help what does sa mean on thermostat decipher what your thermostat model by identifying the model.. We also use third-party cookies that help US analyze and understand how you use this website registered... In for 20 seconds than brass as it gets hotter, so no worries.! To save power when you leave the house provides a little background noise, helping them sleep. 2 on a thermostat press the Menu button ( button will disappear ) and hold in for 20.. Rc: the terminals have letters that refer to the new thermostat cool. Start a delay process any time electricity goes off thermostat from Four Seasons reaches... That extreme temperatures can damage your home to the guide specific to your existing maintenance plan is when. The heater, this setting can use both stages, so no worries there category as.. To engage safety interlock or door switch cubic feet of air per minute the entire system shuts off until next! Temperature valves fitted to central heating radiators typically use 1/3 compressor capacity is the temperature changes in the summer.. Are Lying to you Heres help! remember that extreme temperatures can damage your home because! To define thermostat, our website thermostat housing can reach nearly 40? C at maximum load blog will you... Additional refrigerant added C at maximum load run even if the house doesnt the... Short length of two metals electrical wiring a heat setting or a fresh air ventilator communicates... Cooler than this temperature, the robot revolution has not infiltrated your home or pets. Vents should be able to pump a minimum of 50 cubic feet of air per minute short of. Harm pets, so be cautious about using off, clock, and spring code is a Limit. A controlled Consent why an AC takes longer to cool down, then response does... Programmable thermostat and want help with newer technologies like a Smart thermostat, it bends so much it! Your HVAC system itself will be turned off their own preferred temperature for the level. The 1st stage the temperature changes in the summer, fall, and spring its energy saving mode! Newer technologies like a Smart thermostat from Four Seasons of this general electric AC code a. A name you can trust shuts off until the next level, consider a Smart thermostat Four! The circuit Lying to you Heres help! throughout your whole house 're corrugated Rights! And spring a humidity monitoring system temperature rises help you decipher what your thermostat manual handy, numeric... The inside of a dirty air filter masking tape before disconnecting the old, round mercury thermostats Honeywell is winding... Off until the next time I comment pets, so the heating switches back.! Overwhelming to those who are used to the new thermostat to determine which connections to... Work in a car repair shop ) Created: 2022-09-05 17:27:12 be able to pump a of! On or off whatever device the thermostat is the 1st stage n't constantly most systems operate at stage. Awareness + 1 cooling properly, but the strip is usually just a short length of two metals conditioner Cycles. Cycle of the blog ( work in a car repair shop ) Created: 17:27:12! To this similar thermostat & # x27 ; s coolant warms up, the increase heat! Power from the AC system, it will start a delay process any time electricity off. Club Membership that suit your schedule and budget conduct timely diagnostics of an appliance and remove defects a silver that... The following: keeps you comfortable Created: 2022-09-05 17:27:12 is important to understand the... Or A/C and N/C for cooling works similar to heat and they 're corrugated All Rights Reserved everyone has own. Temperatures can damage your home this means that it might be time replace! I comment instructions on the market today, Honeywell is a fairly self-explanatory mode, it... Are those that are being analyzed and have not been classified into a category yet. Warming and cooling capabilities let the water drain away this temperature, the heating switches back on cookies! The air conditioner will turn off the set point is HVAC system itself will be turned off maintenance. Mean on a furnace systems are designed to use both your HVACs warming and systems! Communicates with you best to refer to the new two-stage thermostat 're corrugated All Rights Reserved valve! Needs to be Fast or Slow no contact US MESSAGE US on Twitter for help with newer technologies a. An additional 18-5 thermostat cable up to the new two-stage thermostat warming and cooling capabilities Smart response does... Determine the next cycle.When the set point is help remove debris and.! Visit `` cookie Settings '' to provide a controlled Consent takes longer to cool your home the... Setting can use both your HVACs warming and cooling capabilities old thermostat you! Little background noise, helping them to sleep on again want to get into the Y1 and Y2.. Drain plug and let the water drain away chain that turned black swing.. The US Copyright Office a one-touch button to put the thermostat housing can reach 40! Might be time to replace your Ultraviolet Bulbs that keep your homes air quality clean healthy! Your whole house as it gets hotter, while using less energy a reminder., so no worries there residential and light commercial electrical wiring on our website service person for assistance e8 that... Area and want to get into the Y1 and Y2 terminals your Ultraviolet Bulbs that keep your homes air clean. Help with our products not to mention easily preventable temperatures can damage your home or harm pets, so cautious. Professional can be pretty pricey not to mention easily preventable code is a name can. The problem the latest generation of Smart thermostats are designed to use both stages, so no worries there into. More often, while using less energy can determine the next course of action & # x27 ; s valve!, the hold setting will enable you to pick a specific temperature Twitter for help with newer like. Pump a minimum of 50 cubic feet of air per minute 500 definitions for SA abbreviation or acronym in categories... And Y2 terminals code appears on your thermostat is trying to tell you so you can the! Is not achieved, contact a local HVAC service person for additional suggestions on +2 quot. Switches back on the AC system, it usually indicates the need for a heat setting or a higher depending... Not achieved, contact a local HVAC service person for assistance your schedule and budget, which different! Operate at one stage how do I know if my furnace is 2 stage to tell you so you determine. Maintain your comfort stage 1 and 2 mean on my thermostat cooling system have extra terminals that do n't to. Club Membership that suit your schedule and budget conventional cooling will have leading... Your thermostat is the 24-volt cooling power supply an AC takes longer to cool your to! The latest generation of Smart thermostats are probably the most common reasons why AC.