An Experienced Heating Contractor Repair of Home Heating and Air Conditioning systems
Professional Heating & Air Conditioning Service, Sales & Replacement
Heating and air conditioning service, sales, and system replacement are what we do best. Our goal is simple: to be the HVAC contractor you confidently recommend to family and friends.
Based near Parker, Colorado, we proudly provide HVAC repair, maintenance, and installation services throughout Parker, Elizabeth, Castle Rock, Highlands Ranch, Lone Tree, Castle Pines, Centennial, and surrounding South Metro communities. We serve residential and light commercial customers across Douglas County, Elbert County, and Arapahoe County.
With nearly 30 years of experience in home comfort solutions, you can trust our team to deliver reliable, honest service focused on keeping your home comfortable, healthy, and safe year-round. Whether you need furnace repair, air conditioner replacement, seasonal maintenance, or new HVAC equipment, we provide solutions you can feel confident in.
We are a licensed, insured, and NATE-certified HVAC contractor, backed by a skilled team of experienced technicians ready to service, repair, or replace your furnace or air conditioning system. In addition to residential HVAC systems, we also service light refrigeration equipment and chillers.
Seasonal HVAC Maintenance Programs
We offer spring and fall HVAC maintenance, including:
Comprehensive system inspections
Preventive service and performance checks
Basic cleaning and efficiency optimization
Routine maintenance helps extend system life, improve energy efficiency, and reduce unexpected breakdowns.
If you’re looking for a trusted local HVAC company in the South Denver Metro area, call us today to schedule service or request an estimate.
Meet the Business Owner
Trusted Heating & Air Conditioning Contractor Serving Castle Rock, Parker & Elizabeth, CO
My name is Glenn Onken, and I’ve been working in the heating and air conditioning industry since 1996. I was fortunate to begin my career learning from a team of highly skilled tradesmen who helped shape the foundation of my first eight years in HVAC. That hands-on experience, combined with decades of real-world problem solving, is what I bring to every customer today.
Throughout my career, I’ve worked for customer-service–focused HVAC companies, served in leadership roles within growing service departments, and gained extensive experience in HVAC system installation, design, and custom fabrication. I’ve designed and installed custom residential and commercial HVAC systems in thousands of homes and businesses.
At OMS Inc, we specialize in heating and cooling repair, maintenance, and replacement, including refrigeration systems and commercial rooftop units (RTUs). Whether you need routine HVAC maintenance, system upgrades, emergency repairs, or a complete replacement, we have the expertise to do the job right.
From homes and offices to commercial buildings, OMS Inc can maintain, improve, rebuild, or replace any HVAC system you rely on—with honest service, quality workmanship, and attention to detail.
Thank you for taking the time to learn about our company. We look forward to earning your trust and keeping your space comfortable year-round.
Heating & Air Conditioning Contractor proudly serving:
Castle Rock, CO
Parker, CO
Elizabeth, CO
