For your next furnace or air conditioner in Orillia, make it Custom Gas. To keep your heating air conditioning systems working at their peak, look no further than Custom Gas. Heating and cooling in Orillia, furnaces and air conditioners including furnace installation, furnace repair, air conditioners and air conditioning repair...we're high efficiency service the 1st time...we're Custom Gas - in Orillia and area since 1978. Offering 24 HR emergency service and repairs to all makes of furnaces and air conditioners. Your furnace and air conditioner in Orillia starts with Custom Gas...high efficiency the 1st time more... See more text