Your Garage, Attic, or Shed Needs Love Too
When we think about keeping our homes cool and efficient in the summer, most of us focus on the living spaces—bedrooms, kitchens, family rooms. But what about the often-forgotten areas like the garage, attic, or shed?
These spaces may not be part of your everyday hangout routine, but they play a major role in your home’s overall comfort, safety, and efficiency. In fact, neglecting these zones in the heat of summer can lead to higher indoor temperatures, damaged stored items, and even unnecessary strain on your HVAC system.
At Lake Michigan Heating, Cooling & Plumbing, we believe whole-home comfort means just that: your whole home, including those extra spaces. Here’s why your garage, attic, and shed deserve attention this summer—and what you can do to keep them in check.
The Problem with Unconditioned Spaces in Summer
Let’s start with the basics: garages, attics, and sheds aren’t typically cooled or ventilated. They often lack insulation, have poor airflow, and are subject to extreme heat buildup during hot days.
- Garages can reach 100–120°F, even if your home is a comfortable 72°F
- Attics can hit 130°F or higher, creating a “heat dome” over your house
- Sheds can turn into saunas, damaging tools, paints, and equipment
This trapped heat doesn’t stay put. It radiates into adjacent rooms, raises your indoor temperature, and forces your air conditioning system to work harder to compensate.
What’s at Risk?
Ignoring these spaces in summer isn’t just uncomfortable—it can cost you in repairs, energy bills, and damaged property.
In Garages:
- Refrigerators or freezers work overtime or break down
- Paint, cleaners, and chemicals degrade faster in extreme heat
- Stored electronics, toys, or holiday decorations can warp or melt
- Heat seeps into shared walls, warming the house
In Attics:
- Heat transfers into upstairs rooms, making bedrooms harder to cool
- Poor ventilation leads to mold or mildew in insulation
- Wood framing or roof decking can warp or dry out
- Stored items deteriorate quickly (paper goods, photos, clothing)
In Sheds:
- Garden tools, power tools, and lawn equipment may rust or crack
- Seed or pet food can spoil
- Paint, adhesives, and sealants can become unusable
How to Show These Spaces Some Summer Love
1. Insulate Strategically
Insulation isn’t just for winter warmth—it works in summer, too, by keeping hot air out.
- Garage: Insulate shared walls, the garage door, and ceiling if it’s beneath a living space
- Attic: Make sure your attic floor is insulated to at least R-38. Consider reflective (radiant) barriers to deflect heat
- Shed: Add foam board insulation to keep stored items protected and temperatures more stable
Lake Michigan Heating, Cooling & Plumbing can help assess attic insulation and recommend energy-efficient upgrades.
2. Improve Ventilation
Proper airflow is essential to keeping heat from building up. Poor ventilation = hot air trapped with nowhere to go.
- Garage: Install passive vents or an exhaust fan to push hot air out
- Attic: Make sure soffit, ridge, and gable vents are clear and balanced
- Shed: Add small windows or vents to promote cross-breezes
Mechanical attic fans or solar-powered ventilation units can also be installed to actively remove excess heat. Our team can help with attic fan installations as part of your summer prep.
3. Seal Gaps and Cracks
Hot air sneaks in through gaps around windows, doors, and frames. Sealing those leaks helps maintain temperature stability.
- Use weatherstripping or foam around garage doors and attic access panels
- Check for daylight around shed doors and patch openings
- Seal penetrations around wiring, vents, and plumbing in attic spaces
This helps keep hot air out—and your cool air in.
4. Consider Passive Cooling Methods
Sometimes, small changes go a long way:
- Use light-colored roofing or shed materials to reflect sunlight
- Install window shades or covers to block direct sun
- Declutter these spaces so air can circulate and heat doesn’t build up around boxes or stacks
If you spend time in the garage for hobbies or projects, a ceiling or wall-mounted fan can also improve airflow and comfort.
5. Avoid Storing Heat-Sensitive Items
Even with improvements, garages, attics, and sheds are still more vulnerable to heat than your living room. Be cautious about what you store there:
- Move temperature-sensitive items like electronics, food, candles, and certain cleaners indoors
- Store paints, adhesives, and chemicals in original containers and in cool, dark areas
- Use sealed plastic bins instead of cardboard boxes to protect from humidity and pests
Bonus Tip: Monitor the Impact on Your HVAC System
If you’ve noticed that your upstairs rooms are consistently warmer, or your AC runs nonstop in summer, your attic or garage could be the reason.
Signs your HVAC is affected:
- AC never reaches the set temperature
- Upstairs rooms are several degrees hotter
- Utility bills spike during summer months
- Hot walls or ceilings next to the attic or garage
Schedule an energy efficiency assessment to identify sources of heat gain and air leakage—and to ensure your HVAC system is sized and functioning properly.
Final Thoughts
Your garage, attic, and shed might not be top of mind when thinking about summer comfort—but they absolutely affect your home’s efficiency, air quality, and HVAC performance. With a few improvements, these forgotten zones can stop working against your AC and start helping your home stay cool and efficient.
At Lake Michigan Heating, Cooling & Plumbing, we help homeowners make smart upgrades that benefit the whole home—not just the thermostat. Whether it’s attic ventilation, insulation assessments, or HVAC service, we’ve got your summer covered.
Need help reducing heat buildup in your attic or garage?
Contact us today for expert advice and long-term solutions.