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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.

People carrying a wood stove insert to install it into a fireplace.
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How to Install a Wood Stove Fireplace Insert

Install a wood stove insert to increase efficiency and heat output from your fireplace.

Brown Pellet Stove
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How to Install a Pellet Stove

We show you how to add a pellet stove as a supplementary, efficient heat source to your house step-by-step.

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.

Ross Trethewey installs a smart thermostat
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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.

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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

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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

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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

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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

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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.

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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

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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

Good-bye, old tank! Before the heating system at the Arlington TV project could be upgraded to natural gas, the old oil tank had to be taken away

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

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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

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How to Install a Through-the-Wall Exhaust Fan

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

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How to Install DIY Radiant Floor Heating

Use a specialized foam panel called Bekotec to lock the PEX tubing in place, cover it with a sand-and-cement mix, and tile away

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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

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How to Install a Whole-House Humidifier

Ask This Old House plumbing and heating expert Richard Trethewey shows an efficient, low-maintenance way to humidify the air

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How to Diagnose Leaks in a Steam Boiler

Ask This Old House plumbing and heating expert Richard Trethewey helps locate the leak on a steam boiler that is losing water

How to Smartify Your Home

Better to buy a hub or stand-alone devices? Sign up with the cable company? Get a Wi-Fi dog camera? Find answers to these and other questions in our connected-home guide of picks and expert advice

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How to Install an Electric Whole-House Fan

This Old House general contractor Tom Silva helps a homeowner install an energy-efficient whole-house fan

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How to Heat a Swimming Pool with an Air Conditioner

This Old House plumbing and heating expert Richard Trethewey installs a device that will heat a pool with the heat produced by an air conditioner

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How to Install a Wireless Thermostat

This Old House plumbing and heating expert Richard Trethewey helps a homeowner install a wireless thermostat to control one zone of heating

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How to Replace a Direct-Vent Water Heater

This Old House plumbing and heating expert Richard Trethewey shows how to install a new water heater when there's no chimney

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How to Install a Fiberglass Entry Door

This Old House general contractor Tom Silva shows how to upgrade an entryway with a brand-new, low-maintenance, energy-efficient door

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How to Install Weather-Sensitive Heating Controls

Save energy and stay cozy by linking your system to the outside temperatures

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How to Weatherstrip a Front Door

This Old House general contractor Tom Silva shares his fast fixes for a drafty door

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How to Choose a Thermostat or Home Automation System

This Old House plumbing and heating expert Richard Trethewey reveals how home automation delivers comfort, convenience and energy savings

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How to Quiet Knocking Baseboard Heat

Silencing squeaky, creaky pipes with This Old House plumbing and heating expert Richard Trethewey