5 Ways to Keep Your Garage Cool During a Heatwave, According to HVAC Experts

Our take

While this article originates in the United States, the core advice translates well to South African homeowners — particularly those in Gauteng, the Northern Cape, and Limpopo, where summer temperatures regularly exceed 35°C and double garages are a standard feature of suburban homes. For SA homeowners, a few local considerations are worth noting. Inverter-driven split-unit air conditioners (widely available from brands like Midea, Samsung, and Carrier) are the local equivalent of the mini-split units recommended here, and many are already load-shedding-compatible when paired with a backup power solution. Insulating a garage door is a relatively affordable upgrade — local suppliers offer DIY foam panel kits — and could meaningfully reduce the heat load on adjacent rooms, easing pressure on your main air conditioning system and lowering your electricity bill. For landlords renting out properties with converted garage flatlets or garden cottages, adequate ventilation is not just a comfort issue — it may carry implications under the Rental Housing Act. Sellers should also note that an insulated garage door is a credible value-add to mention during a listing.