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Old Line Heating and Air offers comprehensive heating and cooling services in Maryland and Pennsylvania, including installation, replacement, maintenance, and repair for all types of HVAC systems. We specialize in air conditioners, heat pumps, and ductless mini-splits. Our team of experts is dedicated to providing top-notch service and ensuring your complete satisfaction. Contact us today for reliable and efficient solutions to your HVAC needs.

Don’t delay. Get your free estimate on your AC, heating, electrical or plumbing needs today. Our friendly staff is ready for your call or fill out a quote form today and schedule your free HVAC estimate!

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    HVAC Services MD & PA

    MD HVAC Services
    1117 Harkins Rd
    Pylesville, MD 21132
    Call MD – (410) 896-7480

    PA HVAC Services
    2515 Delta Rd,
    Brogue, PA 17309
    Call PA – (717) 927-9802

    See Why Our Customers Love Us

    Old Line has been to our house a few times, most recently they discovered we had duct issues. The repair was faster than they originally thought and now not even 24hrs later it is feeling much better in our home. Can’t say enough good things.


    They came out very professional and we decided on a new unit. Price was very fair. We already had estimates. One week later unit was installed and now very comfortable. Excellent communication, professional and fair prices.


    Old Line came for a leak in my water heater. Not only was the fix cleanly done, but he explained what he was doing every step of the way. Really appreciated the honest service and pricing – would strongly recommend!