Who is Overly?

Our team takes pride in their work and make sure it is done right the first time. We know the harmful effects of dirty air in the home and work diligently to make your house clean and energy efficient.

As a member of the American Standard Dealership, Burnham Home Heating Team, Noritz Factory Service Provider, National Comfort Institute Air Balancer, Combustion Analyst, our team receives regular factory training to update their skills. We can always recommend the latest technology for your installations and will troubleshoot your problems in no time.

Our Team

Mark OverlyMark Overly
Owner, Mark Overly HVAC
Phone: 717-341-4318
Email: info@mark-overly-hvac.com


  • IGSHPA Accredited Installer
  • NATE Certified Technician
  • NSI Combustion and Energy Consultant
  • NBI Residential and Light Commercial Air Balancer
  • NCI Heating and Air Conditioning System Performance Rater
  • Noritz Tankless Water Heaters Factory Trained Service Provider


Dustin Schlenbaker

Dustin Schlenbaker
Owner, Tempro HVAC
Phone: 717-380-5607



  • Master HVAC Installer
  • IGHSPA Certified


Cody Dombach electrical

Cody Dombach
Dombach Electrical
Phone: 717-940-1556





  • Controls and High Voltage Electrical


Randall Reedy

Randall Reedy
Phone: 717-413-0841