AC not cooling
Learn why a Houston AC may stop cooling, which checks are safe for a homeowner, and when to turn the system off and call us.
See causes and safe checksHVAC help for Houston homeowners
Common HVAC problems, explained
Start with the symptom you can see, hear, or feel. Each guide explains likely causes, the checks that are safe to make yourself, and the signs that mean it is time to stop and call.
What are the most common HVAC problems in Houston homes?
Houston HVAC problems include AC not cooling, warm or weak air, systems that will not turn on, short cycling, ice, water leaks, blank thermostats, tripping breakers, strange noises or smells, no heat, cold furnace air, shutdowns after lighting, high humidity, high energy bills, and uneven temperatures. Each guide explains likely causes, safe checks, and signs to stop and call.
Cooling problems
AC blowing warm or weak air
Find likely reasons an AC blows warm or weak air in Houston, safe airflow checks, warning signs, and what an HVAC technician tests.
See causes and safe checksAC frozen or iced up
See what causes ice on AC lines or the indoor coil, the safe way to let it thaw, and why repeat freezing needs professional diagnosis.
See causes and safe checksWater around the indoor unit
Learn why water collects around an indoor AC unit, how Houston humidity affects drainage, and when a leak becomes an electrical emergency.
See causes and safe checksHigh humidity indoors
Houston humidity can expose AC airflow, refrigerant, coil, or duct problems. Learn likely causes and the safe checks to make first.
See causes and safe checksHeating problems
No heat or weak heat
Learn why a furnace, heat pump, electric air handler, or mini-split may give no heat or weak heat and what is safe to check.
See causes and safe checksCold air when heat is on
Learn why vents may blow cold air in heat mode, including furnace ignition faults, electric heat-strip trouble, and normal heat pump defrost.
See causes and safe checksFurnace lights, then shuts off
A furnace that lights then stops is often responding to a safety control. Learn likely causes, safe observations, and urgent warning signs.
See causes and safe checksGeneral problems
System will not turn on
Use safe checks when an AC, furnace, heat pump, or mini-split will not start or move air, and learn which causes need a technician.
See causes and safe checksShort cycling
Learn why an AC or furnace starts and stops every few minutes, what a homeowner can safely check, and when short cycling needs service.
See causes and safe checksThermostat blank or dead
A blank thermostat may mean batteries, a drain safety switch, interrupted power, or a control fault. Learn the safe checks and stop points.
See causes and safe checksBreaker keeps tripping
If an AC or furnace breaker trips again after one reset, leave it off. Learn likely HVAC causes and why repeated resets are unsafe.
See causes and safe checksStrange HVAC noises
Learn what HVAC humming, buzzing, clicking, rattling, grinding, or hissing may mean and which sounds require an immediate shutdown.
See causes and safe checksStrange HVAC smells
Know the difference between gas, burning, musty, and first-heat dusty HVAC odors, including when to leave and call from outside.
See causes and safe checksHigh energy bill or constant running
Learn why HVAC energy use rises or an AC runs constantly, including filters, coils, refrigerant, ducts, blowers, and aging equipment.
See causes and safe checksUneven room temperatures
Learn why some rooms stay hotter or colder, including filters, blocked vents, dirty blowers, and duct leakage common in Houston homes.
See causes and safe checks