Welcome to Comfort Guard Comfort Guard is Oklahoma City's source for air conditioning and heating sales, services, and parts. We are a family-owned and operated business specializing in service and support for all makes and models. Our friendly and knowledgeable staff has over 163 years combined HVAC experience. We are licensed and bonded in the state of Oklahoma and provide our professional services to both residential and commercial establishments. We also provide free estimates for new or replacement systems. Comfort Guard Guarantee We give you an added level of security with a guarantee on all of our service calls, and our new equipment offers manufacturer warranties. Ask your representative about our Senior Citizen Discounts and Cool Cash Promotions through Carrier.