What to Do When Your Attic Gets Too Hot
Published on September 04, 2025
When the weather outside heats up, your attic might be following suit. Hot air rises, which typically causes a buildup of heat within your attic, which can cause problems for your home, your comfort, and your wallet. Recognizing that your attic is retaining too much heat and investing in attic insulation costs will help you save money, protect your home, and feel comfortable. At EcoComfort, we provide comprehensive attic inspections that can help you determine what’s making your attic so hot and get an expert plan to upgrade your attic insulation in Mississauga and across the GTA.
Here’s what you need to know when your attic is heating up.
How to Tell Your Attic Is Too Hot
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Most people don’t spend much time in the attic, which can make it challenging to discover that there’s something going wrong up there without paying attention to other signs around the house.
High Energy Bills
When your attic temperatures are too high, your attic insulation won’t be able to perform optimally, causing your air conditioning units to work harder to maintain your ideal temperature. You may not notice how much more your air conditioning is running until you see a sudden spike in your utility bills. Choosing to inspect your home and upgrade your attic insulation in Mississauga can help save you money in the long run by reducing wear and tear on your HVAC systems and minimizing how much energy is being used to heat or cool your home.
Discomfort in Your Home
The entire purpose of attic insulation is to regulate temperatures in your home so you can move and live comfortably. When you go to the second floor and feel overwhelmed by heat, there’s a good chance your attic insulation is not working for you. You may need attic insulation removal, or you may just need to top it up, which could be faster work and have lower costs.
Mould in Your Home or Attic
Mould is attracted to heat and moisture and if your attic isn’t properly ventilated and managing heat, it is likely not effectively removing moisture which significantly increases the risk of mould. At EcoComfort, we offer attic mould remediation, so you can minimize damage to your insulation and protect your indoor air quality.
The Temperature is Too High
If it’s safe to do so, you may be able to check the temperature in your attic. If it’s more than 5-10ºC higher than the outside temperature, your attic will likely be too hot. Attics that surpass 50ºC are at risk for damage to the insulation and the roofing materials. In Mississauga and Southern Ontario, where summer temperatures can reach up to 40ºC, your attic can get too hot, especially without the proper insulation.
Improve Your Attic Ventilation
Attic vents are key to maintaining a balanced temperature in your attic and throughout your home. Strategically placed and professionally installed attic vents will create a continuous flow of air that allows the hot, moist air to leave your home. Soffit vents let cool air in, and vents toward the top of the roof let that air out. Not only does this help maintain comfortable temperatures in your home, but the removal of hot, humid air also helps to keep mould out of your home and attic.
Protect Your Home in Mississauga with EcoComfort Insulators
Upgrading to blown-in cellulose insulation with EcoComfort can help you offset future attic insulation costs, such as attic mould remediation and attic insulation removal. Our attic experts provide a full range of attic services to give you optimal energy efficiency and longevity.
