Are the Batteries Low on Your Home’s Thermostat? Simple Steps for Replacement

Schedule Now

It may seem hard to believe that the smallest, most inexpensive component of the HVAC system yields the most power, but it’s true. Without the thermostat, you have no control over the central heating or cooling equipment, which, in the middle of a Cincinnati heat wave or cold snap, can be devastating. Knowing how to replace batteries in a thermostat can save you time, discomfort and the expense of an unnecessary visit by your HVAC contractor.

Warning Signs

The best course of action is to be proactive with battery changes, opting to switch them out once a year when you turn back the clocks in the fall. This is also a great time to change the batteries in smoke alarms and CO detectors. Warning signs that you might not make it until the fall may include a blank screen, low battery warning or erratic or unusual behavior by the heating or cooling system.

How to Replace Batteries in a Thermostat

The batteries in a thermostat provide power for the digital display, save your programmed settings, and prevent heating or cooling equipment from shutting down in the event of a power outage, making them an indispensable component of the HVAC system. To change them, follow these tips:

  1. Detach the thermostat from the wall mount by pulling toward you. Alternately, try sliding the thermostat up the wall mount and then pull it off.
  2. Turn the unit over to locate the batteries or cover plate and remove.
  3. Insert the new batteries, making sure the positive and negative ends match up with the indicators on the thermostat.
  4. Replace the unit back on the wall mount, aligning the pins on the back with the terminal screw block. Slide down and snap the unit in to place.

If you continue to have issues with the HVAC system after the batteries have been replaced, call for professional service so an HVAC contractor can determine the source of the problem.

For more tips on how to replace batteries in a thermostat, or for any other HVAC concerns, give us a call at Apollo Home Heating, Cooling and Plumbing. We’ve been serving homeowners in greater Cincinnati since 1910.

Image via

"Ernie & Mike did a superb job on my new furnace and A/C installation. Despite having more than a day’s work to do, they came in and stayed until the job was done. They were organized, efficient, and protected the rest of the house well. Got both furnace and A/C installed the same day. Ernie was courteous, informative, and clearly knew his job better than anyone I’ve encountered before. The units look so good guests now get The Tour of our new system. Apollo is clearly not a fly-by-night company. I would recommend them to anyone in need of a new furnace and/or A/C."
- Jerry A.
"I called Apollo because of a water leak I thought I had in our upstairs shower going into the kitchen. Robbie came and assured me everything was fine & looked at all the other plumbing. He ended up changing a few pipes for our washer & clearing a drain. He was very nice & knowledgeable with all my questions. I ended up signing up for the care plan & was very happy with my service."
- Cassandra B.
"The team at Apollo exceeded my expectations. As a business owner, my attention to the details and commitment to providing excellent service is high. From the sales rep. to the installation team, everyone’s performance was outstanding. For example, the installation team went to great lengths to protect our floors, placing floor runners and across the wood floors and up the stairs. They even were spot washing walls upon their departure. I highly recommend this company."
- Randy B.
"We scheduled an estimate AND a tune-up. We knew something was wrong with our furnace, but hoped we could make it through the rest of the season. Upon telling Bill what our furnace was doing, he warned us immediately what the possible outcome was going to be; a cracked heat exchanger. He watched the flames roll backward, tested carbon monoxide levels, which were so high they meter’s last reading was 5,600 before saying “high”. He immediately shut it down, tagged it, and explained that with levels that high and children in our home he wanted off right away. He continued his inspection and showed us via a camera that not only was it cracked in multiple places, but had holes all over it. He gave us a few options for repairing it; his knowledge as well as genuine concern was beneficial and refreshing. Luckily we also scheduled an estimator, Micah, to come too and we were able to get costs between repairing and replacing (with several options). We decided to replace with a much higher efficiency furnace and one sized properly to our home. Hands down, not only did they both provide us great service and knowledge, but without sounding dramatic, they may have saved our lives. This was our first time calling Apollo, but it won’t be our last."
- Sarah B.
"Apollo is an excellent company. I always receive great service. Alex A. was professional and friendly. He kept me informed during the process of checking my furnace and heat pump to make sure they were working properly. The company makes sure you are notified who is coming and when they are on the way. All my interactions with the company have been wonderful."
- Beverly S.



    Apollo Care Plan