Heating & Cooling How To & DIY
Improve the value of your home by discovering our heating & cooling step-by-step tips & ideas.
HVAC Air Balancing: What You Should Know
If you’re struggling with maintaining—or even attaining—a consistent temperature throughout your house, your HVAC system may be out of balance. This guide will explain the basics of air balancing, including how DIYers can tackle the job and when they should call a professional to sort out their home’s heating and air conditioning system.
All About Radiant Floor Heating
Whether it’s warming a large addition or a cozy bathroom, radiant heat underfoot invisibly ups the comfort level. Here’s the lowdown on some of today’s most popular systems.
How to Replace a Tank-Type Water Heater
In this DIY Smarts segment, plumbing and heating expert Richard Trethewey helps a homeowner be proactive about their home maintenance by replacing their existing tank-type water heater before it fails.
How to Get Your Furnace Ready for Winter
Your furnace may need some TLC before starting it up this winter. Here are some tips on what to do to get your furnace prepped before the cold months arrive.
All About Smart Thermostats
Home technology expert Ross Trethewey explains everything there is to know about modern smart thermostats.
How to Install a Window AC Unit
Window air conditioning units may seem intimidating, but they’re actually quite easy to install. With a bit of background knowledge, the right tools, and a guide to show the way, cooler temperatures are on the horizon—even when it’s boiling outside.
How to Bleed a Radiator
If you have hot-water heat, have you ever found that one or more of your radiators isn’t warming up? Or that only the bottom of a radiator gets hot? Before you spend the money on a plumber, try an easy fix.
What to Do If Your Fridge Stops Cooling
Is your refrigerator no longer staying cool? There are a number of reasons why your fridge may be quitting on you. Read our guide to help diagnose and fix your fridge.
How to Build an Outdoor Air Conditioner Cover
Air conditioning is nice to have, but the look of the clunky unit outdoors can be unsightly. Watch as Jenn Largesse, DIY Expert and House One Editor, creates a wooden cover for her air conditioning unit.
How to Upgrade to a Smart Thermostat with Four Wires | This Old House: Live
Ask This Old House home technology expert Ross Trethewey demonstrates how to install a new smart thermostat without an existing common wire. This video is part of This Old House: Live—an initiative providing daily programming and opportunities to connect with our experts during these challenging times.
How to Upgrade to a Smart Thermostat without Changing the Wiring
Ask This Old House plumbing and heating expert Richard Trethewey replaces an old thermostat with a smart thermostat without replacing the original two wires in the wall.
How to Seal Leaky Ductwork
Improve the air quality and keep your home energy efficient by sealing your ducts.
How Do Smart Thermostats Work?
Learn about features, installation, and the difference between traditional and smart thermostats.
How to Create a House HVAC Plan
Richard Trethewey demonstrates heat loss and gain to design a balanced HVAC system.
How to Diagnose and Repair a Humid Air Conditioner
Ask This Old House plumbing and heating expert Richard Trethewey travels to Orlando to diagnose and repair an HVAC system that is creating way too much humidity
5 Money-Saving Ways to Warm Up the House
On average, nearly half of household energy expenses go toward heating and cooling. Here, ways to keep warm without cranking the thermostat
How to Heat a Garage Workshop
Ask This Old House plumbing and heating expert Richard Trethewey travels to Akron, Ohio to install a garage heater.
How to Install a Whole-House Ductless System
Ask This Old House plumbing and heating expert Richard Trethewey shows a style of ductless heat pump that can be used to heat and cool an entire house
How to Maintain an Air Conditioner
Ask This Old House plumbing and heating expert Richard Trethewey shares tips for keeping an air conditioner running efficiently
How an Energy Recovery Ventilator (ERV) Works
Richard Trethewey explains how an Energy Recovery Ventilator (ERV) replaces conditioned indoor air with fresh outdoor air without wasting energy
How to Diagnose a Frosty Air Conditioner
Ask This Old House plumbing and heating expert Richard Trethewey discusses the possible causes and solutions for a frozen air conditioner.
How to Replace a Steam Radiator
Ask This Old House plumbing and heating expert Richard Trethewey replaces a small radiator with one that’s the correct size
How to Install a Wall Mounted Space Heater
Ask This Old House master electrician Scott Caron warms up a chilly bathroom by installing an electric convection heater.
How to Diagnose Problems with a Hot Water Heating System
Ask This Old House plumbing and heating expert Richard Trethewey helps a homeowner figure out why one of her radiators is not working.
How to Remove an Old Fuel Tank
Before the heating system at the Arlington project house could be upgraded to natural gas, the old oil tank had to be taken away.
How to Install Room-By-Room Zoning in an HVAC System
Ask This Old House plumbing expert Richard Trethewey learns about an HVAC system that allows each room to be zoned out using smartphone technology.
All About Ceiling Fans
These air movers keep you cool and look cool doing it. Here’s how to choose a model that’s right for your space
Before You Store That Air Conditioner
Carrying it to the basement isn’t just challenging, it’s dangerous, partly because it can block your view of the steps. Here, ways to save your back—and maybe a trip to the ER
How Thermostat Setbacks Save Money
This Old House plumbing and heating expert Richard Trethewey explains how adjusting the thermostat can reduce energy consumption and save you money.
How to Seal Leaky Ductwork
Ask This Old House plumbing and heating expert Richard Trethewey shows an innovative new way to seal ducts from the inside
How to Install an Exhaust Fan in a Wall
Scott Caron, master electrician for Ask This Old House, helps a homeowner put in an exhaust fan to rid her kitchen of smelly cooking odors.
How to Install DIY Radiant Floor Heating
Use a specialized foam panel to lock the PEX tubing in place, cover it with a sand-and-cement mix, and tile away.
How to Zone a Forced Air Furnace and Air Conditioner
Ask This Old House plumbing and heating expert Richard Trethewey shows how to divide a home's heating and air-conditioning system into different zones.