Carbon monoxide safety check
The unit is checked for carbon monoxide. This is the one that matters most and the reason a tune-up is not optional maintenance on a gas appliance.
Home › Furnace & AC Tune-Ups
Pre-season tune-ups in Lone Tree and the south Denver metro.
Furnace or AC tune-up, $129 each. Boilers, $189. Get it checked before the first cold snap, while it is still a scheduled visit instead of a no-heat call.
Flat rate, quoted upfront
Owner does the work
Licensed & insured
What you actually get
What is included in a furnace tune-up?
A tune-up is a safety inspection first and a performance check second. These are the things that leave a family without heat on the coldest night of the year, and every one of them is cheaper to find in September than to fix in January. Why furnaces quit on the first cold night →
Heat exchanger inspection
A cracked heat exchanger is the serious failure on a furnace. We inspect it and tell you straight what we see, without the scare tactics the industry is known for.
Gas pressures checked
Pressures out of spec make a system run hot, run inefficient, or short-cycle. It is a quiet problem that shows up on your bill long before it shows up as a breakdown.
Flame sensor resurfaced
Oxidation on the flame sensor is the single most common reason a furnace lights and then quits thirty seconds later. Resurfacing it during a tune-up prevents that call entirely.
Filter quality checked
The wrong filter starves a system for air and makes everything downstream work harder. We check what is in there and tell you if it is the problem.
Pilot assembly on older units
On older furnaces and boilers the pilot assembly gets inspected as part of the visit. Older equipment is exactly where a pre-season check pays for itself.
Pre-season pricing
How much is a tune-up?
Flat rate, both quoted before anything starts. No trip fee bolted on afterwards and no upsell built into the visit.
Furnace or AC: $129 each
Priced per system. Most people book the furnace going into winter, and plenty have us check the air conditioner on the same visit so it is ready for next summer without a second trip out.
Boiler tune-up: $189
Boilers, radiant floors and baseboard hydronic systems, which much of the metro will not touch. Same safety checks, plus the pilot assembly on older units.
Why now
When should I get my furnace tuned up in Colorado?
Before the first real cold snap, and the reason is scheduling more than weather. A tune-up booked in early fall is a visit at a time that suits you. The same fault found in January is a no-heat call in single digits, when every heating contractor in the south Denver metro is already booked and you are waiting.
Front Range furnaces sit idle through the summer and then get asked to run hard the first cold night. That first hard run is when the parts that were already marginal finally fail. Finding them while the house is still comfortable is the entire point.
Common questions
Tune-up questions we get on the phone
How much is a furnace tune-up in Lone Tree?
A furnace tune-up is $129 and an air conditioner tune-up is $129, priced per system. A boiler tune-up is $189. Flat rate, quoted before any work starts. If you want both the furnace and the AC done, we can do them on the same visit.
Can you give me a price over the phone?
For a tune-up, yes, the price is flat. For a repair, usually not a firm one. A lot of people call with a diagnosis they already got, either from another contractor or by working it out themselves, and it is often close but not exactly right. We would rather confirm what is actually going on first so the repair is done right the first time instead of replacing a part that was never the problem.
Do you tune up boilers as well as furnaces?
Yes. Boilers, radiant floors and baseboard hydronic systems are work much of the metro will not touch. A boiler tune-up is $189 and covers the same safety checks plus the pilot assembly on older units.
Who actually does the work?
Erica or Jared answers the phone, never a call center or a rotating crew. Jared does the work himself, so the person who diagnoses your system is the one who repairs it.
What if you find something wrong?
You get told what it is and a flat-rate price to fix it before any work starts. Finding a problem during a tune-up is the tune-up doing its job, and it is always cheaper than finding it during a failure.
Where we work
What areas do you cover for furnace repair?
Atlas Mechanical covers the south Denver metro plus the north and west side: Lone Tree, Highlands Ranch, Castle Rock, Parker, Centennial, Littleton, Denver, Aurora, Lakewood, Arvada, Golden, Evergreen and the surrounding communities listed below. That includes Lone Tree, Parker and Castle Rock neighborhoods like Carriage Club, Heritage Hills, Meridian and Castlewood. We are based in Lone Tree and out across the metro daily. If you are close by, call or text (303) 601-1444 and we will get you scheduled.
Lone Tree
Highlands Ranch
Castle Rock
Castle Pines
Parker
Centennial
Littleton
Englewood
Greenwood Village
Denver
Aurora
Lakewood
Westminster
Thornton
Broomfield
Arvada
Commerce City
Golden
Genesee
Evergreen
Indian Hills
Ready when you are
No heat? Let's get it running again.
Call or text and you get Erica or Jared, not a call center. Same-day service when the schedule allows, and a flat-rate price before anything starts.
Furnace questions
What homeowners ask us about heat.
My furnace turns on then shuts off after a minute. What causes that?
That pattern is called short cycling and the most common cause is a dirty flame sensor, which stops proving the flame and shuts the burners down as a safety response. Other causes are a clogged filter restricting airflow, a failing limit switch, or a blocked flue. A flame sensor clean or replacement is usually an inexpensive same-visit repair.
Why does my furnace blow cold air?
If the blower runs but the air is cold, the burners are not staying lit or are not igniting at all. Common causes are a cracked igniter, a dirty flame sensor, a gas valve issue, or a tripped high limit. If the thermostat fan setting is on ON rather than AUTO, the blower simply runs between heating cycles, which also feels cold at the vent.
Is a cracked heat exchanger really dangerous, or is that a sales tactic?
It is genuinely dangerous, because a cracked heat exchanger can put combustion gases including carbon monoxide into the air you breathe. It is also one of the most abused claims in this trade. We show you what we found and why we reached that conclusion, and we would rather you get a second opinion than take our word for a replacement that size.
Should I repair or replace my furnace?
If the unit is under roughly 15 years old and the failure is an igniter, flame sensor, blower motor, inducer or control board, repair almost always makes sense. Past 15 to 20 years, or with a failed heat exchanger, replacement usually costs less over the remaining life than a series of repairs. You get both numbers and you decide, not us.
Do furnaces need to be set up differently at Colorado altitude?
Yes. Gas appliances have to be derated for altitude, which means the burner orifices and gas pressure are set for the thinner air at Front Range elevation. A furnace left at factory sea-level settings runs inefficiently and can soot up. We check and set this on every install and on repairs where it looks wrong.
How fast can you get out when the heat is off?
Often the same day when the schedule allows. Call or text (303) 601-1444 early in the day for the best chance at a same-day slot. We answer until 9 PM, seven days a week.
Do you install whole-home humidifiers?
Yes. A whole-home humidifier mounts on the furnace and treats the entire house, which matters in Colorado winters when indoor humidity can drop into the single digits. We also do air balancing if some rooms run hot or cold. Both are same-visit estimates.
Cooling season question instead? See AC repair, boiler repair, or everything we do.