Best HVAC Schools in Denver, CO (2026)

Denver uses its own 2025 Denver Building and Fire Code, built on the 2024 International Codes and amended by the city, so the mechanical code a Denver technician works to is the International Mechanical Code with Denver's changes written into it. The city published a list of the significant amendments when it adopted the 2025 code, and most of them move Denver closer to the national model rather than further from it: the building code alone lost nearly half its local amendments in this cycle.

One mechanical amendment survives and is worth knowing on a service call. Section 505.9 of the Denver Mechanical Code, and section 623.3.1 of the Denver Fuel Gas Code alongside it, require domestic gas-fired cooking appliances to sit under an exhaust hood vented to the outdoors. The previous Denver amendment had required a power exhaust system discharging to the exterior, while its own title spoke of vented hoods. The 2025 wording settles it: a gas range in Denver goes under a hood that vents outside.

The administrative rules moved as well. Chapter 1 of each I-code, the part covering permits, inspections and enforcement, is largely replaced by Chapter 1 of the Denver Commercial Building Code. A technician who learned section numbers from the model code will find the technical chapters where they expect them and the administrative ones somewhere else.

You need a Denver certificate to operate refrigeration equipment, and it is a different certificate from the ones that let you install it. The Refrigeration Operator certificate lets the holder take charge of and operate mechanical refrigeration systems. It takes three years in refrigeration operation work, as a trainee or apprentice on refrigeration systems of all types, and a pass on ICC exam 228, which the Code Council titles Colorado (Denver) Refrigeration Operator.

The Stationary Engineer certificate sits above it and combines both kinds of plant. It takes four years: three operating high-pressure steam boilers over 10 horsepower and 15 psi, or hot water boilers running above 250 degrees, and one year operating refrigeration equipment that the Denver Building Code requires an operator for. The exam is ICC 227, again written for Denver. The holder may take charge of steam boilers, steam pumps, turbines and engines, and mechanical refrigeration systems together.

This is the side of the trade the Colorado page does not reach, because it is about who is allowed to run a building's plant after it is installed. Facilities work in hospitals, campuses and large commercial buildings is where these certificates are asked for, and the experience they require is operating time rather than installation time, so it cannot be borrowed from a journeyman installer's hours.

HVAC techs in the Denver metro make a median of $71,580 a year, which is $6,380 above the Colorado median of $65,200 and $10,570 above the national median of $61,010. The hourly median is $34.41. Denver pays well clear of both its state and the country, on a workforce of 4,360.

The floor is what stands out. The bottom tenth of Denver HVAC technicians earn $49,010 or less, which is above the national 25th percentile of $48,360: a new technician at the bottom of the Denver range earns more than a quarter of the trade nationally. The middle half runs from $59,080 to $90,390, and the top tenth earn $104,880 or more, $9,670 above the national 90th percentile of $95,210.

These figures come from the Bureau of Labor Statistics wage survey of May 2025 for occupation 49-9021, covering the Denver-Aurora-Centennial metropolitan area, which takes in Denver, Adams, Arapahoe, Jefferson, Douglas and Broomfield counties and four smaller ones. The survey reports what people earn, not why, and it makes no forecast about hiring.