The Secret Cash Leak in Your Ceiling: How a Simple Fix Can Slash Your Summer Bills and Keep You Cool

With the heat wave coming for most of the country during the first week of July, many homeowners are prepping to put their air conditioners to work.

But if you often find that your home seems too warm in the summer, it’s only natural to assume there’s an issue with your AC.

The real problem, however, may be the result of poor attic insulation and unsealed gaps, which often act as a “cash leak” during peak summer heat.

“Don't automatically believe there’s a problem with your AC and you’ll need to upgrade to a bigger or better system. I've been in many homes where improved insulation and sealed air leaks have made a huge difference. There’s no need to replace perfectly good HVAC equipment if you don’t have to,” explains Lane Martin, co-founder at Modern PURAIR in Kelowna, BC.

Fortunately, a bit of time, knowledge, and inexpensive materials is all it may take to stop the cool air from escaping, slash your energy bills, and ensure a comfortable home all summer long.

The mechanics behind this issue (and how to fix it)

On hot summer days, attics are brutally hot—often hitting between 130 and 150 degrees Fahrenheit. 

If your attic is poorly insulated, the hot air will heat the living space directly below it. 

“Furthermore, any unsealed openings around your attic accesses, recessed lights, and ductwork may create shortcuts for cooled air to leak out and hot attic air to leak in,” says Scott Eyman, project manager at Eyman Plumbing, Heating, & Air in Omaha, NE.

Essentially, your AC has to work harder and longer to keep your home cool. It’s a lot like trying to cool your house with your windows open. 

To remedy the issue, make sure the attic hatch, which is typically a square or rectangular panel in the ceiling that you can push up and remove, closes tightly. 

“Then, replace any worn weatherstripping. This should only cost you about $10 to $20 in materials,” Eyman explains.

Next, look for obvious openings where pipes, electrical wiring or ductwork pass through the attic floor. If you find a gap, Eyman recommends sealing it with caulk or expanding foam, which will likely run you $20 to $30.

In most cases, you’ll be able to resolve this cash leak on your own, as long as you feel comfortable accessing your attic, but in some cases, an HVAC pro is worth calling.

“If your insulation is incomplete or missing, an HVAC professional should replace it for around $1,500 to $3,500. Also, if you notice signs of mold, pests, or damage or disconnection in your attic ductwork, call a pro,” Eyman advises.

How much you can save

When it comes to potential savings, every house is different, so there’s no magic number. 

However, according to Eyman, an attic that’s sealed and insulated correctly can save you 15% to 20% on your cooling bills during the hotter months.

“For an average summer electricity bill of $300 per month, that could mean $45 to $60 per month in savings. Those costs could be covered in as little as two to three cooling seasons,” explains Eyman.

You’ll likely notice the improved comfort before you notice your lower electricity bill. Plus, you’ll  find your upstairs stays cooler and temps are more evenly distributed throughout the home. 

You’ll no longer hear your AC constantly cycle on and off to try to catch up. And lastly, your AC system will last longer because it won’t have to work as hard to cool down your home.