Insulate the entire garage. If your garage ever becomes too cold, it can damage not only your car, but also anything else you have in storage. Are your washing machine and dryer kept in the garage? If your washer still has water left in the pump or lines, it can freeze and crack. The same risk is possible with your vehicle’s fuel gels, which can freeze in the combustion engine. Another possibility that can arise is that paint can separate and become ruined during prolonged periods of freezing temperatures.
Repair or replace your weatherstripping. Weatherstripping will create an effective seal between your garage door opening and the garage door. If you notice any cold draft leaking into the garage between the garage door frame and the garage door, then take away any of the existing weatherstripping if you see that it is cracked or brittle. Scrape off any sealant that remains, using a putty knife and pry bar or flat scraper. Make sure the surface is as clean and even as possible. After you remove the old weatherstripping completely, then measure correctly in order to apply the new weatherstripping. To align it, close the garage door and make sure the rubber flap slightly flattens against it. You will have an effective seal and the garage door will operate smoothly.
Install a unit heater in the garage. Weatherstripping and insulation will keep your garage protected from extremely cold temperatures in winter weather, but if you’d like to be extra warm, then add a unit heater. (On the other hand, if you’re located where your winters are mild, then an electric unit heater is probably all you’ll need, since you’ll need heat only once in a great while.) You can heat your garage with minimal construction costs and space requirements. Overall, gas-fired units are normally cheaper to operate, but they’re more difficult to install since they require a gas supply and exhaust venting. There’s also the electric model, which is easier to install yet more expensive to manage. A particularly efficient electric option is the mini-split heat pump, which provides efficient cooling and heating for your garage with a mere 3″ hole through an outside wall.
Protection in Hot Weather
During summer, your main objective is to enhance the airflow throughout the garage. Taking even just one of these measures is definitely worth considering:
Insulate the garage ceiling. If you use paper-backed batt insulation, ceiling wallboard isn’t needed. Install the insulation with staples, paper side down, or put the insulation in place using netting. You can also apply staples to fasten the netting. Professional garage door technicians advise you to do both.
Plant a tree close by. A hardwood or deciduous tree is an aesthetic and economical way to cool your garage down during summer. (And, it even keeps your garage warm during winter.) Plant the tree between the garage and the position of the sun in the warmest part of the day. The leaves will provide shade. (In winter, the bare branches will allow sunlight to come through, providing warmth.)
Leave the garage door open slightly, about a foot from the ground, and add a fan, too.
Wall insulation keeps out summer heat with desirable efficiency. Use wallboard or other paneling to encapsulate the material. You’ll prevent pets, toddlers, and teenagers from tearing things out.
Install a stationary vent on the roof. This is an inexpensive way to create an exit point for hot air that gets trapped in the garage’s attic. Or, if your budget allows it, install a mechanical exhaust system. Fans will draw cooler air from the garage into the attic. This will cool down the attic as well as the space below.
Insulate the garage overhead door. For a metal garage door, add a layer of rigid insulation that’s 2″ thick, attached to the inside of each panel with contact cement. Or, an insulated sectional overhead door is a superior alternative.
Attach an adjustable rollaway awning onto the garage’s sunny side. The shade will cool things off during the summer.