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How to Seal Leaky Ductwork

Improve the air quality and keep your home energy efficient by sealing your ducts.

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.

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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 Clean a Window Air Conditioner

Stay cool and save money with five simple tasks–most done just once a year–that ensure your unit keeps working efficiently.

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How to Repair a Frozen Air Conditioner

This Old House plumbing and heating expert Richard Trethewey shows how to prevent ice buildup from shutting down an air-conditioning system

Air conditioner fence
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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.

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How to Create a House HVAC Plan

Richard Trethewey demonstrates heat loss and gain to design a balanced HVAC system.

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How to Insulate HVAC Ductwork

This Old House plumbing and heating expert Richard Trethewey helps a homeowner insulate his HVAC ductwork

Ask TOH Season 2, Ep25, Tom Silva replaces weatherstripping
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How to Weatherstrip an Exterior Door

This Old House general contractor Tom Silva shares tips for fixing a drafty door

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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.

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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

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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

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How to Install a Wall-Mounted Mini Split

Plumbing and heating expert, Richard Trethewey explains the purpose of a mini split ductless air conditioner and the process of getting one installed.

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How to Quiet a Banging Steam Radiator

This Old House plumbing and heating contractor Richard Trethewey silences a rattling radiator

How Do Smart Thermostats Work?

Learn about features, installation, and the difference between traditional and smart thermostats.

Person removing baseboard heater covers.
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Baseboard Heater Cover Removal and Replacement

Here’s how to remove your old baseboard heater covers and replace it with a new one for a fresh, clean look.

17 Fireplace Remodel Ideas

We rounded up our favorite ideas to help you update your fireplace for a more modern look.

Two people installing thermostatic radiator valve to an old radiator.
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How to Install Thermostatic Radiator Valves

We show you how to add a manageable control to your old radiator by installing a new thermostatic valve.

How to Seal a Door Gap

We show you how to use silicone weatherstripping to fill gaps in your door.

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How to Quiet Heating Pipes

This Old House plumbing and heating expert Richard Trethewey shows how to silence noisy heating pipes.

Person installing thermostatic steam radiator valve.
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How to Install a Thermostatic Steam Radiator Valve

Add controls to a steam radiator with these step by step instructions and video to guide you.

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How to Seal Windows and Doors for Winter

Tom Silva shows you how to keep cold air from coming through windows and doors.

Balancing a Ceiling Fan

Is your ceiling fan wobbly and rattling? This guide will show how to easily and safely balance and level your ceiling fan blades.

People installing new combination boiler in a basement.
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How to Install a Combination Boiler and Hot Water Heater

Replace two devices, your water heater and boiler, with a single combi boiler unit that’s more efficient and compact.

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How to Install a Ductless Mini-Split Air Conditioner

This Old House plumbing and heating expert Richard Trethewey explains how the pros retrofit a compact cooling unit.

Central Air Installation: Costs & Best Units to Get

Want to install central AC to your home? Read this guide to learn more about central air installation, from installation costs to selecting the best unit.

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.

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How to Install a Ductless Heat Pump

This Old House plumbing and heating expert Richard Trethewey and host Kevin O'Connor install a ductless heat pump to heat and cool a room

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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

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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.