Markool Heating & Cooling - Frederick's Qualified HVAC Services

Our air duct cleaning and sanitization services help improve your home's indoor air quality by removing accumulated dust, allergens, and microbial growth from your ductwork. This is especially beneficial in our area, as it can help your HVAC system run more efficiently, potentially lowering energy costs and extending the system's lifespan. We also offer filter replacement as part of a complete indoor air quality solution.

Yes, this is a common issue we address for homeowners in Frederick, often related to the heat pump's reversing valve. Our NATE-certified technicians are experienced in diagnosing and repairing reversing valve problems, as well as clearing clogged condensate drains that frequently occur in our climate. Prompt repair of these issues is key to restoring your system's efficiency and preventing further damage.

We provide professional water heater installation and repair. As a Carrier Factory Authorized Dealer, we often recommend and install their high-efficiency water heaters, but we work with a range of quality brands to fit your specific needs and budget. Our licensed plumbers ensure the installation is done correctly and safely, whether it's a traditional tank model or a tankless system.