AC & furnace repair guides & tools
From an AC blowing warm air to a furnace that won't light: find the cause, check what you safely can, and know the fair price before the technician arrives.
Tools and guides
- AC & furnace problem finderAnswer 5 questions to find why it's not cooling or heating.
- AC replacement cost estimatorEstimate a new central AC by home size and tonnage.
- Furnace replacement cost estimatorCompare gas, electric, propane and oil furnace prices.
- HVAC maintenance checklistSpring AC and fall furnace checklists, plus tune-up costs.
Common heating and cooling problems
- AC Not Cooling? Check the Air Filter First (Fix & Cost)DIY easy · pro $75–$200
- AC Not Blowing Cold AirDIY pro only · pro $100–$400
- AC Refrigerant LeakDIY pro only · pro $200–$1,600
- AC Freezing Up? Why There's Ice on Your AC & How to Fix ItDIY easy · pro $150–$650
- AC Leaking Water Inside? Clear the Condensate Drain (Cost)DIY easy · pro $75–$500
- Thermostat Not Working? Quick Fixes & Replacement CostDIY easy · pro $85–$300
- Furnace Not HeatingDIY moderate · pro $150–$600
- Furnace Blower Not Working? Causes & Blower Motor CostDIY pro only · pro $400–$2,300
- Heat Pump Not Heating? Troubleshooting & Repair CostDIY moderate · pro $150–$650