AC Thermostat Repair & Replacement

Q: How do I know if my thermostat is broken?

If your AC or heater won’t turn on, keeps running nonstop, or doesn’t match the temperature you set, the thermostat may be the issue. Other signs include a blank screen or unresponsive buttons.

Q: Can a faulty thermostat affect my AC or heat?

Yes. A bad thermostat can cause your system to short cycle, run inefficiently, or stop working altogether. It may also send the wrong signals, leading to uneven temperatures or high energy bills.

Q: What causes a thermostat to stop working?

Old age, power surges, loose wiring, dead batteries, or software glitches (on smart thermostats) are common causes. Florida’s heat and humidity can also impact thermostat performance over time.

Q: Should I repair or replace my thermostat?

If it’s a minor issue like wiring or calibration, a repair may be all you need. But if your thermostat is outdated or repeatedly causing problems, replacing it with a newer model might be the better option.

Q: Can I replace my thermostat myself?

It depends on your comfort level with wiring and setup. A DIY install can work for basic models, but smart thermostats or compatibility issues often require a pro to avoid damaging your system.

Q: Do you repair all types of thermostats?

Yes, FL-Air Heating & Cooling services standard, programmable, and smart thermostats. We’ll diagnose the issue and get your home back to a comfortable temperature quickly.

Home » Services » Thermostat Repair

Your thermostat is the control center of your heating and cooling system, determining when your HVAC unit turns on and off based on the temperature you set. When your thermostat malfunctions, your home’s comfort can suffer, leading to uneven temperatures, AC system inefficiencies, and higher energy bills. A faulty thermostat can make it seem like your AC or heater is broken when, in reality, the problem lies within the thermostat itself.

If your home is not reaching the temperature set on your thermostat, your AC system is short cycling, or your HVAC won’t turn on or off as expected, your thermostat may need professional attention. At FL-Air Heating & Cooling, we specialize in diagnosing and repairing thermostat problems, ensuring your home stays comfortable year-round.

Common Problems Needing Thermostat Repair

A malfunctioning thermostat can disrupt your HVAC system in several ways. Some of the most frequent thermostat issues include:

Inaccurate Temperature Readings

Your thermostat is responsible for sensing the temperature in your home and adjusting the HVAC system accordingly. If it’s giving incorrect readings, your system may turn on and off at the wrong times, making your home too hot or too cold. This can be caused by dust buildup, faulty sensors, or improper thermostat placement (such as being near windows, vents, or direct sunlight).

Unresponsive Controls or Display Issues

A thermostat that doesn’t respond when you try to adjust the settings or has a blank screen could be experiencing electrical issues, low battery power, or internal component failure. Some thermostats rely on battery power, while others are hardwired. If your thermostat is unresponsive, it may need battery replacement, rewiring, or a full replacement.

AC System Won’t Turn On or Off

If your AC or heater refuses to turn on despite the thermostat being set correctly, the issue may be faulty wiring, a broken relay switch, or a connection problem between the thermostat and the HVAC system. Similarly, a system that won’t shut off may be caused by a stuck relay or a thermostat failing to detect when the desired temperature has been reached.

Frequent Short Cycling

Short cycling occurs when your HVAC system turns on and off too frequently without completing a full heating or cooling cycle. This can lead to increased wear and tear, higher energy bills, and inconsistent indoor temperatures. A malfunctioning thermostat that misreads temperatures or fails to communicate properly with the system can cause short cycling, forcing your HVAC to work harder than necessary.

Higher Energy Bills

A failing thermostat can cause your HVAC system to run inefficiently, consuming more energy than necessary. If your energy bills have suddenly increased without a clear explanation, your thermostat may not be regulating your system correctly, leading to unnecessary cooling or heating cycles.

Thermostat Repair and Troubleshooting

If your thermostat is experiencing any of these issues, our FL-Air Heating & Cooling technicians can diagnose and repair the problem quickly. We begin by thoroughly inspecting your thermostat and HVAC system to determine whether the issue lies with the thermostat itself, the wiring, or the HVAC unit.

Some of the most common thermostat repairs include:

Recalibrating the temperature sensor to ensure accurate readings.
Repairing or replacing faulty wiring that prevents proper communication with the HVAC system.
Clearing dust and debris inside the thermostat that may be affecting performance.
Adjusting the placement of the thermostat to ensure it reads room temperature correctly.
Replacing broken relays or internal components to restore full functionality.

If your thermostat is too old or beyond repair, we may recommend replacing it with a newer, more efficient model to enhance comfort and energy efficiency.

Thermostat Replacement and Upgrades

If your thermostat is outdated, unreliable, or incompatible with modern HVAC systems, replacing it with a new model can significantly improve your home's energy efficiency. FL-Air Heating & Cooling offers professional thermostat installation services, ensuring your new thermostat is correctly set up and optimized for your heating and cooling system.

Types of Thermostats We Install

Programmable Thermostats – These allow you to set temperature schedules throughout the day, reducing energy waste when you’re not home.
Smart Thermostats – These advanced models offer Wi-Fi connectivity, allowing you to control your home's temperature remotely from a smartphone app. Many smart thermostats also have learning capabilities that adjust settings based on your habits, maximizing efficiency and comfort.
Wi-Fi-Enabled Thermostats – Unlike traditional programmable thermostats, these models let you monitor and adjust temperature settings from anywhere, ensuring energy savings while you're away.

Upgrading to a modern thermostat can lead to more precise temperature control, lower energy bills, and a longer-lasting HVAC system by preventing unnecessary wear and tear.

Why Choose FL-Air Heating & Cooling?

At FL-Air Heating & Cooling, we understand that a properly functioning thermostat is essential for maintaining a comfortable and energy-efficient home. Our team of skilled technicians has the expertise to troubleshoot, repair, and install thermostats for all HVAC systems, ensuring you get the most out of your heating and cooling equipment.

We provide:

Expert diagnostics and repairs for all thermostat brands and models.
Seamless thermostat replacements to enhance efficiency and performance.
Smart thermostat setup and configuration for ultimate convenience.
Affordable pricing and transparent recommendations so you can make the best choice for your home

Schedule Your Thermostat Service Today

Don’t let thermostat issues compromise your home’s comfort or cause unnecessary energy waste. Whether you need a simple repair, a thermostat upgrade, or a full HVAC system evaluation, FL-Air Heating & Cooling is here to help. Contact us today at 813-800-2665 to schedule an appointment and keep your AC running at peak performance all year round.

FL-Air Heating & Cooling repairs faulty thermostats across Hillsborough, Pasco, and Pinellas Counties. We serve all cities including Tampa, Lutz, Land O’ Lakes, Wesley Chapel, Brandon, Clearwater, and St. Petersburg. If you're in the Greater Tampa Bay area, give us a call—we’ll get your system back to cooling fast.

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LEE ERICKSON

In my opinion the company did a great service for me. After I have called and talked with them they sent a technician out and he was here right on time that we agreed upon. He was professional in his duties diagnosing the problem we had with our air conditioning equipment. The parts were ordered, they called and let me know the parts were in and scheduled the time for the technician to come out, the technicians was here on the agreed time. Brandon was our technician who did the diagnosed and did the work installing our parts, he worked very professional steady, and finished in a timely manner. I feel the company should be very proud of Brandon to represent their company the way he did very professional. Their prices were reasonable. I would definitely highly recommend their company. I would definitely use them in the future. I also feel that they have great service plans I would definitely recommend those also.
Lee E

Ca D

Today Brandon Boudreau with Fl-Air Heating & Cooling did 3 and a half hours of hot sweaty work in my attic removing years of growth and just nastiness from the two air handlers in my south Tampa attic. This entailed basically disassembling both handlers, removing and cleaning both blowers, cleaning electrical and all surfaces. He further installed UV lights in both units to prevent future buildups. He worked tirelessly and quietly.

I’ve used Fl-Air Heating & Cooling for years now. They are big enough to meets our needs and keep their Techs up to date, but they are still small enough to be responsive when we need them the most. Their Techs are friendly, professional and respectful and their prices are very reasonable. I wholeheartedly recommend this company.

D Caldwell

Technician Bobby was punctual and personable. He performed a maintenance on my AC. He answered any questions I had. I am very pleased with the work Bobby did and FL-Air as a whole. Thank you!

DAVID MAURO

Brandon Boudreau was very knowledgeable about all aspects of Heating/AC.
Thank you Brandon for your great service.

Dennis & Susan O'Neil

These people really know their stuff and care about doing a good job. My problem was complex as my copper lines routed thru walls failed and had to be rerouted. The owner actually came out to see that it was done right.