Troubleshooting in plain English
Find your symptom below, described the way you'd describe it to a neighbor. Each one explains what's probably going on and where to get it fixed.
(615) 412-2495Cooling problems
The classic. Usually it's the thermostat set wrong, a clogged filter, a frozen coil, or low refrigerant from a leak. Check the thermostat mode and filter first. If it's still warm, you need a pro to find the leak or failed part.
When the system never catches up, suspect restricted airflow, a refrigerant leak, or a unit that's undersized or worn out. Running a struggling system nonstop risks burning out the compressor, which turns a repair into a replacement.
Ice on the copper lines or the outdoor unit means something is wrong with airflow or refrigerant. Turn the system off and let it thaw, check the filter, then call. Running it frozen can destroy the compressor.
Heating problems
Check that the thermostat fan is set to AUTO, not ON. If it still blows cold, the usual suspects are a failed igniter, a dirty flame sensor, or a tripped limit switch. Gas furnace issues deserve a pro, not DIY.
Some drop-off in extreme cold is normal for heat pumps, but if yours falls behind on a moderately cold day, it may be low on refrigerant, stuck in defrost, or miswired at the thermostat. Aux heat running nonstop is a red flag for your bill.
Start with the thermostat, filter, and breaker. If those check out and the system is dead silent, it could be the igniter, control board, or a safety switch doing its job. Don't keep resetting breakers; get a diagnosis.
Behavior problems
Short cycling wears out parts fast and never dehumidifies properly. Causes range from a clogged filter or bad thermostat to an oversized system or low refrigerant. It won't fix itself, and waiting makes it worse.
Banging often means a loose or broken part. Grinding points to motor bearings. Squealing is usually a belt or motor issue. Rattling can be as simple as a loose panel. New noises are your system's way of asking for help early.
When the electric bill jumps and nothing else changed, the HVAC system is suspect number one. Frozen coils, leaking ducts, and heat pumps stuck on emergency heat are the usual culprits. A diagnostic visit usually finds it fast.
Before you call
These solve a surprising number of service calls, and there's no shame in checking them first. We'd rather you save the service fee.
If none of that helps, it's time for a technician. Refrigerant, electrical components, and anything inside the unit are pro-only work. Curious how cooling actually works? Read how air conditioning works for the full picture.
Deeper dives
We write about the problems Gallatin homeowners ask us about most:
Common questions
This usually points to restricted airflow, low refrigerant from a leak, a frozen evaporator coil, or an aging system that can no longer keep up. Start with the simple checks: thermostat set to COOL with the fan on AUTO, and a clean filter. If the system still cannot pull the temperature down, it needs a professional diagnosis before the strain burns out the compressor.
Heat pumps move heat rather than making it, so their output air feels cooler than furnace air even when working correctly. But if the air is genuinely cold and the house is losing ground, the system may be stuck in defrost, low on refrigerant, or running on emergency heat with a problem. If your backup heat runs constantly on a moderately cold day, have it checked.
Yes. A system that turns on and off every few minutes wears out electrical components fast, never runs long enough to dehumidify properly, and drives up energy bills. Common causes include an oversized system, a failing thermostat, low refrigerant, or a clogged filter. It is worth diagnosing sooner rather than later.
Check four things: the thermostat is set to the right mode with the fan on AUTO, the air filter is clean, the circuit breaker for the indoor and outdoor units is on, and the outdoor unit is not blocked by debris or ice. These solve a surprising number of calls. If none of them help, it is time for a technician.
The thermostat is calling for cooling but something downstream is not responding. It could be a failed capacitor or contactor at the outdoor unit, a tripped breaker, a frozen coil, or a blower problem. Check the breaker and filter first. If the outdoor unit is not running at all, you likely need a repair visit.
Tell us what your system is doing in plain language. We'll take it from there.
(615) 412-2495 Call Gallatin HVAC Repair Pro