Fast, reliable HVAC control solutions by Professional Systems, from thermostat repair to smart thermostat installation across Mobile County. When your thermostat is not working correctly, your entire HVAC system becomes unreliable: the AC will not turn on, the house cycles hot and cold, or the screen is dead. Our licensed technicians diagnose whether the problem is the thermostat, the wiring or the system, fix it in one visit, and tell you honestly when a replacement makes more sense.
Call (251) 680-7500 Request a QuoteThermostat problems often appear subtle at first, then turn into comfort and energy problems. Watch for these:
If you notice any of these, we can quickly identify whether the problem is the thermostat, the wiring, or the HVAC system connection, and we tell you which before anything is replaced.
Call (251) 680-7500
We test the thermostat, the low-voltage wiring and the control board together, because the symptom at the wall often starts at the air handler.
Loose, corroded or chewed low-voltage wiring, a missing common wire, a shorted cable in the attic, a blown 3-amp fuse or a failed transformer, repaired and protected.
Accuracy adjustments, and relocating a thermostat that was hung in the wrong spot so it reads the air you actually live in.
Dead batteries, a common wire added so the display stays powered, and the float switch or fuse that cut the signal in the first place.
Wi-Fi connectivity, app and system integration, scheduling that never runs, sensor and zoning problems on Wi-Fi enabled systems.
When the unit is outdated or damaged, a replacement that matches your system: digital, programmable or smart, installed and set up with you.
Inspect the thermostat, the wiring and the HVAC connections at the air handler and the condenser.
Identify communication, power or calibration issues with a meter on the terminals, not a guess at the wall.
Fix the wiring, recalibrate, resolve software and schedule issues, or replace the unit if that is the honest call.
Run the system through heating and cooling calls to confirm proper cycling and temperature control.
Advice on upgrades or preventative maintenance if needed, in writing, with no pressure.
Same or next-day diagnostics across Mobile and Baldwin County, with the thermostat, the wiring and the system tested together.
We service all major thermostat types: digital thermostats, programmable thermostats, smart thermostats with Wi-Fi, and traditional manual thermostats, on single-stage and multi-stage systems, heat pumps with auxiliary heat, dual-fuel systems and ductless mini splits. If the thermostat on your wall came with the house in 1998, we can usually keep it running, and we can tell you what a modern one would save.
Smart thermostat expertise is a real part of the job now. Modern homes rely on them for energy savings and convenience, and when a smart system has connectivity issues, incorrect scheduling or app syncing problems, our technicians sort out the thermostat, the wiring and the equipment settings together, which is the part a phone app cannot do.
Upgrading to a smart thermostat can improve energy efficiency and cut monthly utility costs, but only when it is installed to match the system. A heat pump with auxiliary heat strips, a two-stage condenser or a dual-fuel setup needs the right wiring and configuration, or the thermostat runs the expensive heat when it should not. We add the common wire, set the equipment type, build the schedule with you and connect the app before we leave.
Smart thermostat installation is the call we get most from Mobile, Prichard, Saraland and the rest of Mobile County, usually after a homeowner bought the thermostat and found the wall had no common wire. Already own one that is fighting you? We handle Wi-Fi and app problems, sensor calibration, zoning conflicts and the settings that make a smart thermostat short-cycle an older air conditioning system. Ask about rebates when you call; we tell you what applies rather than promising.
More than 25 years with Mobile's climate and HVAC demands, where humidity and eight-month cooling seasons expose a weak control signal fast.
Most thermostat calls are seen the same or next day, and the repair is finished in that visit.
We test before we replace, which prevents unnecessary thermostat replacements and finds the fuse, float switch or wire that was the real problem.
The price in writing before the work starts. No hourly surprises, and a replacement only when it is the better value.
Skilled technicians who are as comfortable with a 1990s mercury stat as with a Wi-Fi thermostat on a dual-fuel heat pump.
The same technicians repair the air conditioner, the heat pump and the ductwork the thermostat is talking to, and handle every other heating and air job on the house.
"I called on a Friday evening due to my AC not cooling and in less than an hour a technician was at my home. Very professional and knowledgeable. I had to have my air handler replaced and on Monday I received my quote and on Wednesday they were there to replace it."
— Paula D., Google review"They solved my many electrical problems in my 58 yr old home & installed a whole home generator! They even found & fixed a problem that could have easily started a fire in my attic! Excellent work at a fair price."
— Betty M., Google review"I've worked with them on several projects and they are amazing to work with. Caleb has always been very responsive and keeps me informed of the status of each project. I've also worked with Mark on the HVAC and he's just as professional."
— Jim B., Google reviewA professional diagnostic is the only reliable way. Many HVAC problems originate from faulty thermostat signals rather than the system itself, and the reverse is just as common: a tripped float switch or a blown low-voltage fuse at the air handler makes a perfectly good thermostat look dead. We test both in the same visit.
Many issues, such as wiring problems, calibration errors, dead batteries and a missing common wire, are repaired. If the unit is outdated or damaged, or the repair costs more than a quality replacement, we say so and give you the replacement price in writing.
Most thermostat repairs are completed within a single service visit. A wiring repair through an attic or a smart thermostat installation with setup takes longer, but is still usually finished the same day.
Yes. We service and troubleshoot most major smart thermostat brands and systems: Wi-Fi connectivity, app integration, scheduling, sensors and zoning, and the equipment settings behind them.
Most smart thermostats need a common wire for steady power, and many older Mobile homes do not have one at the wall. We pull a new wire or add an adapter at the air handler, depending on the house, so the thermostat does not drop offline or drain the system transformer.
The signal is leaving the thermostat and not arriving: a blown 3-amp fuse, a float switch tripped by a clogged drain line, a failed transformer or a broken wire. It is the most common thermostat call we run in summer, and it is usually a quick fix once it is found.
It depends on whether it is a wiring repair, a calibration or a replacement, so we quote it in writing after the diagnostic and before any work. A service call that ends with a fuse and a cleared drain line costs far less than a new thermostat, which is why we test first.
Something we didn't cover? See our full FAQ page or call (251) 680-7500.
Every HVAC service we offer in Mobile and Baldwin County, in one place.
Heating & airHeat pumps sized for coastal Alabama, with the controls set up right.
Heat pumpsDehumidifiers, filtration and purifiers that work with your thermostat and system.
Air qualityIf your thermostat is causing inconsistent temperatures or system issues, do not wait for the problem to get worse. Fast, dependable thermostat repair in Mobile, AL, with the price in writing.
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