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HVAC

How to Quiet Noisy Ducts

Is there a way to stop the banging from your metal ductwork? Richard Trethewey diagnoses the problem and points to some solutions

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Serviceable Plumbing and HVAC Installations | Pro2Pro Premiere

Watch as Richard Trethewey and John Deforge of SG Harold Plumbing and Heating discuss the challenges that service technicians face on the job.

Improve Your Attic Ventilation with Soffit Vents

Here’s how to install soffit vents step by step to improve the airflow in your attic.

How to Remove Air Pollution in the Home

While a tight, well-insulated home is great for saving energy, trapping lots of stale air indoors can undermine your health. Here’s what you need to know to ensure that the quality of the air inside is healthy and free from harmful pollutants.

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How to Choose the Right Furnace Air Filter

Reviewing air-filter options with This Old House plumbing and heating expert Richard Trethewey

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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

Exploring a Heat Pump Clothes Dryer

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

How to Buy an HVAC System for Any Kind of Home

Consider design, comfort, and greater energy efficiency when installing a new HVAC system

All About Heating & Cooling

No matter how unpleasantly hot or cold it is outside, we can stay comfortable indoors because of heating and cooling equipment. The varied technology we have today for mechanically heating and cooling indoor spaces is truly amazing.

How to Keep a House Warm in Winter

13 simple things you can do to cut down on your heating bills, save money, and have a warm house.

How to Seal Leaky Ductwork

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

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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.

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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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Cape Ann Project Heating Plan

Our plumbing and heating expert Richard Trethewey explains the general layout of the heating and cooling system in our Cape Ann project

Heat Pump Advances

These days, everyone is doing their best to conserve energy. Richard Trethewey’s best advice: don’t create heat, move it! Heat pumps are a great option for keeping everyone in your house warm without breaking the bank.

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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 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

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How to Install a GPS-Enabled Smart Thermostat

Ask This Old House plumbing and heating contractor Richard Trethewey installs a thermostat that can be programmed automatically from a smart phone

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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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Staying Safe with Natural Gas

Ask This Old House plumbing and heating expert Richard Trethewey and host Kevin O’Connor discuss how gas regulators work and how their malfunction caused gas explosions in Lawrence, MA

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

Signs Your Chimney Needs a Checkup

Gathering around a wood-burning fireplace is an irresistible winter ritual, but a fire is still, well, a fire.

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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 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

Take the edge off your energy bills – meet the heat pump water heater

Your home’s most forgettable appliance could be wasting hundreds of dollars per year

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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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Sizing up a Home Heating System

Richard Trethewey explains how to assess a home’s heating system – and figure out whether you’ll need to replace it

Shopping Guide: Air Purifiers and Humidifiers

By reader request, here are our picks for air purifiers and humidifiers to help you through flu and allergy season. These are sound investments for any healthy home

Read This Before You Buy Ductless AC

These quick-to-retrofit ductless AC systems provide unrivaled operating efficiency and room-by-room zoning comfort.

Top 10 Air Conditioning Tips

Beat the heat this summer by having the cleanest, coolest, and most-efficient air conditioner on the block.