Quality HVAC Repair And Installation

Our team of HVAC Repair & Service Professionals have been servicing the Maryland & Pennsylvania area for decades. Find out what sets us apart in HVAC.

Qualified Heating and Air Technicians

Operating In Your Area Now


Central Air
Central Heating
High Velocity Systems
Ductless Split Systems
Radiant Floor Heat
Boilers / Water Heaters
Tankless Boilers
Humidifiers / Dehumidifiers


Central Air
Central Heating
Furnace Repair
New Boilers / Heaters
HVAC Coolant
Emergency Services
Heat Pump Repair
Humidifiers / Dehumidifiers

Ductwork Installation

Design & Installation
Custom Ductwork Fabrication
Square / Round Ductwork
New Construction
System Sealing and Testing
Air Filtration
Humidifiers / Dehumidifiers

Air Quality Testing

Filter Replacements
Inefficient Ductwork
Outdated HVAC Systems
Poor Insulation
Mold & Bacteria Remediation
Bad Odors in the Air
Animal Remains
Dirty Humidifiers / Dehumidifiers

Professional HVAC Repair & Installation Services For Your Home Or Business

Old Line Heating and Air HVAC Team

30+ Years Of Experience

Family Owned And Community Oriented

When it comes to selecting a company for heating and air repair and installation, our business stands out as the top choice for all your HVAC needs.

With years of industry experience and a team of highly skilled technicians, we offer unparalleled expertise in installation, repair, testing, and maintenance services. Our commitment to exceptional customer service ensures that we prioritize your comfort and satisfaction above all else.

Experience the difference our reliable and trustworthy team can make for your home or business.

We were started in 2019 by veteran HVAC Engineer James Reprogel.

Why People Are Choosing Us For Their HVAC Maintenance and Installation

Air Conditioning Repair with Pressure Gauge and Air Purifier

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!


Call Us Today

We are here for all of your HVAC needs!