Markool Heating & Cooling offers professional services for commercial HVAC in Frederick, MD. Commercial heating and cooling systems are much different than residential furnaces and air conditioners. At Markool Heating & Cooling, our technicians provide a full range of commercial services. Whether you need repairs, new installation, or maintenance, we are the team to trust. Don’t let a problem with heating and air affect your business. Let us provide you with the peace of mind that you, your employees, and your customers will stay comfortable year-round.