Home Heating & Cooling Guide

Heating and cooling problems are easier to work through when you start with what the system is actually doing instead of guessing which component failed. You don't need to diagnose compressors, refrigerant circuits, electrical controls, or combustion equipment. You do need to know what you can safely check and where to stop.

AC runs but the house is hot

Start with:

• Why Is My AC Running but Not Cooling?
• Why Is My AC Blowing Warm Air?
• Why Is My AC Running Constantly?
• Why Does My AC Keep Turning On and Off?

Check the thermostat, filter, vents, and obvious airflow issues before assuming the system needs replacing.

Water around the AC

Start with:

• Why Is My AC Leaking Water?

Air conditioners normally pull moisture out of indoor air, and that moisture should drain where the system is designed to send it. Water around the equipment or inside the house means something needs attention.

Strange sounds

Read:

• Why Is My HVAC Making a Strange Noise?

A new grinding, banging, squealing, or strong electrical buzz is a different category from normal airflow and startup sounds.

One room is always uncomfortable

Read:

• Why Is One Room Hotter Than the Rest?

The equipment may not be the only factor. Sun exposure, room location, airflow, ducts, insulation, and air leakage all contribute.

Furnace won't start

Read:

• Why Won't My Furnace Turn On?

Check the normal thermostat and household controls. Don't bypass furnace safety switches or start working on gas components.

Routine maintenance

Read:

• How Often Should You Change Your HVAC Filter?
• How Often Should HVAC Be Serviced?
• What Homeowners Can Check Before Calling for AC Repair

Maintenance can't guarantee that equipment will never fail. It can keep airflow and operation normal and may catch developing problems before peak season.

Repair or replace?

Read:

• Should I Repair or Replace My HVAC System?

Don't decide on age alone. Consider the actual failure, equipment condition, repair history, comfort, operating costs, and what the replacement proposal includes.

Know where DIY should stop

Homeowner troubleshooting should stay on the safe side of the equipment. Refrigerant systems, high-voltage electrical components, internal repairs, and combustion systems require proper training and tools.

Find local HVAC help

If you've completed the reasonable homeowner checks and the system still isn't working right: Find Local HVAC Help