Air and Heat Guide helps homeowners in the United States understand, troubleshoot and make smart decisions about their heating, cooling and indoor air quality systems.
When your AC stops cooling in July or your furnace won’t light in January, you need clear answers fast: what is probably wrong, what you can safely check yourself, and when it is time to call a licensed technician. That is what we write.
What you’ll find here
- Troubleshooting guides for air conditioners, heat pumps, furnaces and thermostats, organized by symptom.
- Error code explanations for major HVAC brands, based on the manufacturers’ own documentation.
- Cost guides that break down what installations and repairs typically cost, so you can judge a quote.
- Indoor air quality advice on filters, humidity, dehumidifiers and air purifiers.
- Maintenance checklists you can follow season by season.
Who runs this site
Air and Heat Guide is edited by Dave Harlan, a home improvement writer focused on residential HVAC. Dave researches every topic using manufacturer manuals, installation guides, government and utility resources, and industry data, and keeps each guide focused on practical, safe steps a homeowner can take.
We are not an HVAC contractor and we do not sell equipment or services. Our guides are for general information and are not a substitute for an on-site inspection by a qualified, licensed professional.
Our approach to safety
Gas appliances, refrigerant and high-voltage electrical components can be dangerous. Whenever a fix involves gas, refrigerant handling or live electrical work, we say so clearly and recommend a licensed technician. If you ever smell gas, leave the home immediately and call your gas utility or 911 from outside.
Get in touch
Questions, corrections or suggestions are always welcome. Visit our Contact page to reach us. You can also read our Editorial Policy to learn how we create and update content.