10 DIY Home Insulation Projects You Can Do in 15 Minutes

A door snake is one of the quickest insulation tips. It only takes a few seconds.

Hairless cat keeping warm in a red and blue sweater
Image: Retales Botijero/Westend61/Offset

A little bit of DIY home insulation can protect you from a drafty house and a scary energy bill. You can lower your heating and cooling costs by as much as 20% if you plug all the places drafts are sneaking in.

Though most people ask a pro to do the big job of insulating walls and ceilings, here are some quick insulation tips you can do in 15 minutes or less.

#1 Get a Door Snake — the Simplest DIY Home Insulation Ever

Multi-colored knit door snake on wood floor | DIY Insulation
Image: @su_or_so

Keep drafts from sneaking in with a door snake, an object you place along that crack under your door. A 1/8-inch gap can let in as much cold air as a 2.4-inch diameter hole in the exterior wall, so a door snake makes a difference.

A rolled-up blanket makes a great snake — or you can buy the real deal for less than $20.

#2 Caulk Around the Dryer and Bathroom Vents

The hole in the wall where your dryer and bathroom vents exit the house leak air, too. Go outside and put silicon caulk on the outside edge of the vents, where it meets the wall.

You'll also keep bugs and other critters from sneaking in through the vent gaps.

#3 Hang Heavy Curtains

White, red, and blue washable Roman window shade

Hang curtains or shades made of thick material that will keep in your expensive, man-made heat during the winter and keep out room-baking sun in the summer.

Open the drapes during sunny winter days. The light lifts your mood and heats your home.

#4 Put Weather Stripping Around Doors and Windows

Gaps around doors and windows are a top source of heat loss.

Install — a narrow piece of metal, vinyl, rubber, or foam — around them to stop conditioned air from escaping, and outdoor air from coming in.

#5 Install Window Insulation Film

Woman using hair dryer to install insulation film on window

Window film adds a layer of cold-blocking plastic that reduces heat loss by around 10%. It comes in sheets you cut to size, tape to the window glass, and then heat with a blow dryer to fit snugly and smoothly. It won't block natural light, so you can have your sunshine and your insulated window, too. You can also use this on sliding glass doors.

Make sure to clean your windows first, or the adhesive on the film may not stick.

#6 Add Foam Board to Patio Doors

Cut the heat loss from that glass door by installing rigid insulation board over any doors or portions of doors you don't use during the cold months. Cut the panel to fit the door, and slip it into the doorframe in the winter. Come spring, pop it back out.

#7 Put Insulation Sleeves on Water Heater Pipes

Gray foam pipe-sleeve insulation on pipe | DIY Insulation

Keep pipes from losing heat (or worse, freezing and exploding one very cold day!), by wrapping them in a pipe sleeve. They're strips of fiberglass insulation that fit around the pipe. You can tape them to the pipe.

Bonus: You'll raise water temperature by two to four degrees, so you won't have to wait as long for hot water.

#8 Wrap Your Water Heater in an Insulation Blanket

Basement water heater wrapped in silver insulation blanket

If your water heater is old or in an unheated area of your house, you'll cut your heating bill by as much as 16% with an insulation blanket. There are different types of insulation blankets for water heaters, but most are made of fiberglass or foil and cost less than $50.

You'll need to wrap a gas heater differently than you do an electric one. For safety and access reasons, different elements of each type can't be covered. Read the instructions for your heater type carefully.

#9 Get a Fireplace Plug

Underside view of black fireplace balloon wedged in chimney

Your fireplace and chimney can be a superhighway for drafts, with one study showing an open fireplace increases heating bills by as much as 30%. A fireplace plug — an inflatable piece of urethane that you stick in the hearth when you're not using it that looks a lot like a square balloon — keeps cold air out and warm air in.

#10 Install an Attic Stairway Insulator

Draft-Out insulation cover on attic stairs | DIY Insulation

The door in your ceiling that leads to the attic is another source of money-sucking drafts. An attic stairway insulator (also called a stair cover) is a tent-like insert made of foam, aluminum-coated fabric, or fiberglass that you can strap or staple into the doorway.

Look for one with a zipper opening so you can crawl into the attic without pulling out the insulator.

Related: A DIY Energy Audit to Figure Out Where You Have Leaks

A headshot of Leanne Potts

Leanne Potts

Leanne Potts is an Atlanta-based journalist and serial home remodeler. She's tackled five fixer-uppers and is working on a sixth. She's written about everything from forest fires to dog-friendly decor and spent a decade leading the digital staff of HGTV.