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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 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

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.

S20 E18, Ross Trethewey talks about smart thermostats
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All About Smart Thermostats

Home technology expert Ross Trethewey explains everything there is to know about modern smart thermostats.

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

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.

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How to Create a House HVAC Plan

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

How to Seal Leaky Ductwork

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

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.

Repairing a frozen air conditioner at home
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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.

How Thermostat Setbacks Save Money
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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.

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.

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

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.

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.

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.

All About Building an HVAC

Keep reading to learn about the best HVAC technologies for indoor comfort and energy efficiency, according to This Old House plumbing and heating expert Richard Trethewey.

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.

10 Easy Ways to Cool Your Home

Staying cool doesn't necessarily mean you have to pay a fortune to keep the air-conditioning running day and night. Here are 10 ways to keep your home cool in the warmer months.

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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.