HVAC
Heating, cooling, and air quality
How-To Guides18
Bleed radiators
Release trapped air from hot water radiators using a radiator key to restore even heating and eliminate cold spots.
beginner
Change HVAC filter
Replace your HVAC air filter to maintain air quality and system efficiency
beginner
Check AC refrigerant
Check for signs of low refrigerant in your AC system before calling for service.
beginner
Check Thermostat Batteries
Replace thermostat batteries to maintain consistent heating and cooling control and preserve your programmed settings.
beginner
Clean AC condenser coils
Clean your outdoor AC condenser unit by removing debris, vacuuming fins, and rinsing with a garden hose to restore cooling efficiency.
beginner
Clean air ducts
Clean accessible areas of your air ducts to improve air quality between professional cleanings.
beginner
Clean HVAC vent covers
Clean all HVAC vent covers throughout your home for better air quality.
beginner
Clean window AC filter
Clean your window AC filter to maintain cooling efficiency and air quality.
beginner
Furnace Troubleshooting - What to Check Before You Call
Furnace not working? Before you call for service (and pay a diagnostic fee), check these common issues yourself. You might fix it in minutes—or at least know what to tell the technician.
intermediate
HVAC Filter 101 - Everything You Need to Know
Your HVAC filter is the single most important maintenance item in your home. Learn how to find it, size it, choose the right MERV rating, and know when to replace it.
beginner
HVAC Maintenance for Denver & High Altitude Homes
At 5,280 feet, Denver's air is thinner—about 17% less dense than at sea level. This affects how your HVAC system performs.
intermediate
Inspect heat pump
Inspect your heat pump to ensure it's running efficiently in both heating and cooling modes.
beginner
Preparing Your AC for Summer
Your air conditioner has been off all winter. Give it some attention before the heat arrives, and it'll reward you with reliable cooling all summer.
beginner
Preparing Your Furnace for Winter
Your furnace has been sitting idle all summer. A little fall prep work ensures it's ready when you need it—and helps you catch problems before they leave you shivering.
beginner
Replace thermostat batteries
Replace thermostat batteries to maintain consistent heating and cooling control and preserve your programmed settings.
beginner
Schedule HVAC tune-up
Schedule professional maintenance to keep your heating and cooling system running efficiently.
beginner
Understanding Your HVAC System
Your HVAC system doesn't have to be a mystery. Learn how furnaces, air conditioners, and heat pumps actually work—and why that knowledge helps you maintain them better.
beginner
Winterize window AC units
Prepare your window AC unit for winter storage or cover it if leaving installed.
beginner
Articles3
Filter Sizes Cheat Sheet
Most common filter sizes, how to measure, where to buy, and replacement schedules at a glance.
beginner
Furnace Error Codes by Brand
LED blink codes for Carrier, Trane, Rheem, Goodman, and Lennox furnaces. What they mean and what to do.
intermediate
HVAC: DIY vs Call a Pro
Know which HVAC tasks are safe to handle yourself and which require a professional.
beginner