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How to Create Zones in a Forced-Air HVAC System

This Old House plumbing and heating expert Richard Trethewey shows how to control the temperature to every room of the house

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How to Adjust Water Heater Temperature

Ask This Old House plumbing and heating expert Richard Trethewey shows how to change the temperature on your water heater for safety and energy savings

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How to Install an Electric Heat Pump Water Heater

Ask This Old House plumbing and heating expert Richard Trethewey travels to Celebration, Florida to help a homeowner select and install the right electric water heater

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How a Heat Pump Clothes Dryer Works

Ask This Old House plumbing and HVAC expert Richard Trethewey tests out a new dryer in our DIY Smarts series that uses a heat pump to dry the clothes.

Diagnosing a humid air conditioner at home
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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 Maintain an Air Conditioner

Ask This Old House plumbing and heating expert Richard Trethewey shares tips for keeping an air conditioner running efficiently

Kevin O’Connor holding a wrench up to a radiator.
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How to Convert Radiators into Multi-Zone Heating

Upgrade an old radiator heating system with This Old House plumbing and heating expert Richard Trethewey.

Fixing baseboard heater
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Baseboard Heater Making Noise? Here’s How to Fix It

Ask This Old House plumbing and heating expert Richard Trethewey helps a homeowner diagnose and solve a baseboard hot water system that makes noise.

Richard Trethewey pointing out how to add radiant heating to a solid wood floor
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How to Install Radiant Heat Under a Solid Wood Floor

This Old House general contractor Tom Silva shows how to run radiant heat tubing under a new hardwood floor

Hot water heating system
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How to Install an Air Valve for a Hot Water Heating System

In this how-to video, This Old House plumbing and heating contractor Richard Trethewey prevents trapped air from stopping a heating system cold in its tracks.

How to Choose a Thermostat or Home Automation System
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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

How to Maximize Comfort with a Thermostat
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How to Maximize Comfort with a Thermostat

Ask This Old House plumbing and heating expert Richard Trethewey and home technology expert Ross Trethewey discuss improvements to thermostats and how they contribute to comfort in a home

Diagnosing frosty air conditioner
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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.

Diagnosing problems with hot water heating system
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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.

Fixing knocking baseboard heat
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How to Fix Knocking Baseboard Heat

This Old House plumbing and heating expert Richard Trethewey explains how to silence squeaky, creaky pipes.

DIY Radiant Heating at Home
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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.

Retrofit air conditioning with mini ducts
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How to Retrofit Air Conditioning Using Mini Ducts

In this video, This Old House plumbing and heating contractor Richard Trethewey explains the benefits of this felxible cooling system.

Installing electric radiant heating
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How to Install Electric Radiant Heating

In this how-to video, This Old House plumbing and heating contractor Richard Trethewey explains the warming attributes of electric radiant heat.

Installing a forced air furnace and air conditioner
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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.

Installing an exhaust fan in the kitchen
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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.

Radiator valve
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How to Repair Radiator Valve Threads

In this video, This Old House plumbing and heating contractor Richard Trethewey and host Kevin O'Connor shows how to cut threads for a new radiator air vent.

Creating zones in hot water heating system
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How to Create Zones in a Hot Water Heating System

In this how-to video, This Old House plumbing and heating contractor Richard Trethewey shows how to share the warmth by installing zone valves.

Installing a whole-house humidifier
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How to Install a Whole House Humidifier

Ask This Old House plumbing and heating expert Richard Trethewey shows how a professional would install a whole-house humidifier.

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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.

Woman turning on radiator at home
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How to Maintain a Steam Radiator

In this how-to video, This Old House plumbing and heating contractor Richard Trethewey shows how to silence a whistling radiator.

Noisy Forced Air System
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How to Fix a Noisy Forced Air System

In this how-to video, This Old House plumbing and heating contractor Richard Trethewey shows how to quiet a loud heating duct.

Slip cover for baseboard heating
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How to Upgrade Your Baseboard Heater with Slip-On Covers

This Old House plumbing and heating contractor Richard Trethewey reveals a quick, easy way to replace a damaged baseboard heater.

Installing radiant heat in house
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How to Install Radiant Heat

This Old House plumbing and heating expert Richard Trethewey shows how to retrofit an old home with new under-floor heat.

Installing a humidifier into a forced air system
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How to Add a Humidifier to a Forced-Air System

In this how-to video, This Old House plumbing and heating contractor Richard Trethewey demonstrates how to add a humidifier to a forced-air system.

Cast iron radiator at home
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How to Paint a Cast Iron Radiator

In this how-to video, This Old House plumbing and heating contractor Richard Trethewey explains how to revive an old painted radiator.

Richard stands next to a newly moved baseboard
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How to Move Baseboard Heating

Ask This Old House plumbing and heating expert Richard Trethewey helps a homeowner by moving a hot water baseboard heater from one side of a room to another.

Diagnosing leak in steam boiler
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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