Air Conditioning & Heating service are what we do. Our Goal is to be the one company you will recommend to family and friends. I am delighted to live in Elizabeth, CO and serve the people of Parker, Elizabeth, Castle Rock, Highlands Ranch, Kiowa, Castle Pines, Larkspur and surrounding areas. We service the south metro area and surrounding communities. If you need maintenance or new equipment you can feel comfortable with our 20 years of experience in the industry and our dedication to keeping your home comfortable healthy and safe. We are licensed, insured and NATE certified and have a great team of skilled tech's to repair or replace your furnace or air conditioner. We also work on light refrigeration equipment and chillers.








-Meet the Business Owner 
My name is Glenn Onken,
I started in the heating & air conditioning Industry in 1996, was fortunate to have great, skilled teachers help train me for the first 8 years of my career. I have always worked for customer service oriented companies and have brought all the knowledge I learned to the table in my own HVAC business, I have been the backbone of several growing service departments and also have installed and built custom ductwork, Refrigeration systems and commercial RTU systems from the beginning of my years in HVAC. Onken Mechanical Service can maintain, rebuild or replace anything you have in your home, office or business. Thank you for taking time to check us out.


  Heating & Air Conditioning   OMS INC

Designer of Home Comfort solutions - THE ONE YOU WILL RECOMMEND! â€‹Heating and Air Conditioning Parker     

  NATE Certified Heating and Air Conditioning in Parker - Highlands Ranch - Castle Rock