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Insulation in an attic

How to Insulate a Crawl Space

Unless your home is built on a concrete slab, it has a crawl space, a basement, or a combination. These spaces are a handy place where you can run your plumbing, HVAC, and wiring, plus they can help keep the rest of your house warmer. To reap the temperature-regulating benefits of a crawl space, it must be adequately insulated. Read on to learn why you should insulate your crawl space and how to do so.

S20 E19, Ross Trethewey and Nathan Gilbert discuss sealing windows with Kevin O’Connor

The Most Practical Air Sealing Techniques

Home technology expert Ross Trethewey and carpenter Nathan Gilbert share some cost-effective ways to seal and insulate existing windows without replacing them.

ASK S7 E7, sealing windows and doors for winter

How to Seal Windows and Doors for Winter

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


How to Choose the Right Insulation

Ask This Old House general contractor Tom Silva discusses the options for insulation with host Kevin O’Connor


How to Insulate HVAC Ductwork

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


How to Retrofit Cellulose Insulation

In this video, This Old House general contractor Tom Silva explains how to install cellulose insulation

Easy Fixes for Drafty Windows and Doors

Read these 8 things you can do yourself to keep warm inside your home.

How to Insulate an Old House

We share different types of insulation so you can select what works best for your home’s interior walls.

Ice Dam Prevention

Here’s how to prevent ice dams in 8 steps so you can enjoy a winter free of icicles and the damage they can do to your roof.

How to Cut Batts of Fiberglass Insulation

3 easy steps and neat trick to safely make tidy cuts in fiberglass insulation batts.

How to Install Insulation

Learn how to beef up your wall's weather protection in 4 easy steps.

Adding Attic Insulation

Can you blow insulation over existing insulation? How much is enough? We answer these questions and more.

Read This Before You Insulate Your Attic

Yes, it's a messy job. But when the dust (and fiberglass) settles, you'll enjoy a fatter bank account and more comfortable indoor temps year-round.

The Best Way to Insulate an Existing Concrete-Block Wall

Tom Silva gives some advice on insulating a brick Colonial with concrete-block walls

How to Insulate Around Recessed LED Fixtures

Scott Caron offers advice on how to keep your home energy-efficient when using recessed lights

How Do I Insulate a Basement Ceiling?

Does it make sense to insulate my basement ceiling? This Old House’s Tom Silva answers.

Read This Before You Finish Your Attic

Whether you envision your house's top floor as an away-from-it-all master suite, a quiet home office, or a kids' hangout, don't lift a finger until you've read TOH's expert advice.

All About Insulation

Insulation in your home increases interior comfort, while decreasing heating and cooling costs.

How Much Could You Save by Insulating Your Home?

Save money and increase your home's market value by upgrading your insulation.

Stop Drafts at the Door

Spread across the bottom of a standard 3-foot-wide entry door, a 1⁄4 inch space can let in as much air as a 3.4-inch hole in the wall. Keep cold out and precious heated air in by closing the gap with a door sweep. Here, three types of "door bottoms" (as they’re also called) to consider


How to Maximize the Impact of Insulation

Ask This Old House general contractor Tom Silva shares some DIY Smarts tips for insulating an attic.

What Makes Stone Wool a Smart Insulation Choice

How the Natural Power of Stone Can Increase the Comfort of Your Home

Best Smart Home Products

The pros at share their top product picks, including "smart" bulbs, locks, smoke detectors, and more


Tips with Tommy: Stone Wool Insulation

It’s efficient, easy to install, and incredibly effective; hear what Tom Silva has to say about this versatile insulation product

Ask This Old House Know-How: All About Stone Wool Insulation

TOH affiliate Nick Schiffer discusses the benefits of mineral wool insulation

Mind the Window Gaps

If you can feel a breeze around your closed windows, consider these quick-and-easy ways to block drafts. Such stopgap measures eliminate air leaks by sealing sash perimeters from indoors. Come spring, add or replace weatherstripping for a longer-lasting fix


200 Years of Building Sheathing Technology

Kevin O'Connor and building science expert Joe Lstiburek discuss the benefits of using OSB sheathing


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


Understanding Insulation and R-Value

Ask This Old House general contractor Tom Silva explains R-value and the need for good insulation

Editors' Video Picks: Insulation Tips for Every Corner of Your Home

Airtight solutions for your house's drafty problems


How to Beef Up Attic Insulation

Cost-effective way to save energy with This Old House general contractor Tom Silva


How to Choose and Use Foam Insulation

This Old House general contractor Tom Silva explains the wide world of spray-foam insulation