Look straight on at your thermostat; you will see a place where you can press down to release the compartment on the top right side of the thermostat. Low battery indicator light on your thermostat that may also include a beep from your thermostat unit. Turn the wall thermostat housing over to find the battery removal slots. Thermostat Troubles Can Cause Short Cycling. Your air conditioning or furnace isn’t operating quite reliably. Your thermostat could also cause the HVAC system to cycle on and off rapidly, a process known as short cycling. I didn't know this, as I inherited the thermostat from a friend. Your furnace or central air conditioner spends a good amount of energy simply turning on and off, which is why you want yours to run for at least 15 minutes at a time before shutting off. Your air conditioner’s job is to carry hot air out of the home and blow cool air in. Can low thermostat batteries cause an AC condensor to stop? A weak car battery can cause your auto air conditioner to function poorly or not at all. The simplest answer is also the most likely: The thermostat is old or just faulty. A thermostat in direct sunlight, for example, will sense warmer temperatures and will respond as if the indoor temperature is hotter than it actually is. The batteries in your thermostat can last as long as five years or as little as a few months – so if your thermostat is turned on but still blank, try swapping out the batteries. I didn't read all the responses, but thought this would help. Issues That Can Affect Air Conditioning in a Home. Here’s how you change the batteries. For most cars the air conditioning is powered by a belt from the engine and even if the car is only idling it will be running without any meaningful effect on the car's battery. The fan on the unit kept blowing, but only moving warm air. I have a programmable thermostat at home. If your thermostat has a R and Rc, then there has to be a physical wire (jumper) connecting the R and Rc, along with the red wire going into the R slot. The temperature settings you program into a digital wall thermostat don’t impact battery usage (e.g., turning down the air conditioning in the summer won’t save the battery life of your thermostat; you’ll just save on your energy bills). How to change the batteries in your thermostat will depend on its make and model, but most thermostats have a removable battery compartment that is easily accessible. Check thermostat location: The location of your thermostat can affect how it functions. Large holes or openings behind thermostats could also cause inaccurate temperature readings. Depending on the brand, here are two recommendations: If your thermostat has an external battery compartment. I noticed the "replace batteries" indicator came on the other day on my way out the door to work. Car batteries need to have enough voltage to trigger the AC compressor, and while it may be strong enough to run the rest of your car, it may still be too weak to run your car's air conditioning. You get a blank screen and can’t set your thermostat or turn your HVAC system on. Heat turned on, AC did not. Can a low battery affect air conditioning? Last night my AC condenser stopped working. An AC thermostat that won't work can be incredibly annoying. OK. There are a number of problems that the AC thermostat can cause, including refusing to allow the air conditioner to turn on at all and not letting it reach the programmed setting. Pry out the old batteries by setting a small, flat-blade screwdriver into the slots and lifting up. How can you change the batteries? External battery compartment the slots and lifting up location of your thermostat or turn your HVAC to... Thermostat has an external battery compartment the unit kept blowing, but thought this would help n't this. 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