Alliance Energy Source is a trusted HVAC company providing professional heating and cooling services throughout the Greater Toronto Area , including Richmond Hill , Toronto and Markham since 1999. Our certified technicians specialize in air conditioner installation, AC repair, furnace installation, furnace repair, and complete HVAC maintenance to keep your home comfortable year‑round. I am super happy with the service that Alliance gave us. Not only lower price than all also delivered a great service and greater follow up response. I would recommend them as they offer the best brands, price and service.