Markool Heating & Cooling excels at installing modern residential thermostats in Middletown, MD. Your thermostat acts as the control center for your heating and cooling systems. When it grows too old or begins malfunctioning, it can impact your bills, comfort, and safety. After your current thermostat exceeds 10 to 15 years, consider upgrading to an improved smart thermostat. These devices save you time and money by optimizing how you control your indoor comfort.