Unionville Heating and Air Conditioning has been voted a Readers’ Choice 2025 Diamond Winner in both Markham and Stouffville — the highest honour awarded by Metroland Media’s annual community vote. The Diamond award represents the top tier of recognition, decided entirely by local residents who nominated and voted for the businesses they trust most. Earning it in two communities at once reflects something we’re proud of: over 40 years of honest service and the loyalty of the neighbours we’ve been working alongside since 1985.