We’re Ponderosa Heating & Air Conditioning, and our mountain office is at 26267 Conifer Road, up in Aspen Park. That’s the crew that shows up at your door. Conifer is the highest town we serve: the community sits at 8,262 feet, and the subdivisions on Conifer Mountain climb well past that. The homes here are on two-acre-and-up lots, on septic and often on a private well, on propane as often as gas, and at the end of roads that US 285 has to stay open for.
Heating a home in Conifer is different from heating one in Evergreen, let alone Lakewood. The altitude is higher, the fuel is more likely to be a tank, and the fire risk is the kind that has already burned houses here. Here’s what that means for the equipment in your basement.
Ponderosa Heating & Air Conditioning services furnaces, boilers, water heaters and gas fireplaces in Conifer, Colorado (ZIP 80433), from its office at 26267 Conifer Road in Aspen Park. Equipment is sized for 8,000 feet and up, and for Jefferson County’s colder design temperature. Conifer at a glance:
8,262 ftcommunity elevation; Conifer Mountain runs to ~9,500 ft
−11 °FJeffco winter design temp — all of Conifer
1986median year built (ACS 2019–2023)
1 in 5ZIP 80433 households on propane (ACS)
~75,000 BTUwhat a 100,000 BTU furnace delivers at 8,262 ft
Mar 26, 2012Lower North Fork Fire: 4,410 ac, 23 homes, 3 lives
Heating, cooling & gasthe Conifer crew — no generators, electrical or plumbing
26267 Conifer RdUnit 209 — our mountain office, Aspen Park
At 8,262 feet, every furnace in Conifer needs the manufacturer’s high-altitude conversion. That’s true in Evergreen too, a thousand feet lower. What’s different in Conifer is where the band ends.
Goodman and Amana publish three altitude bands for their gas furnaces. Up to 7,000 feet is standard. From 7,001 to 9,000 feet the furnace needs orifice kit HANG11 and pressure switch HAPS27. From 9,001 to 11,000 feet the parts change again. The community elevation puts all of Conifer in the second band. But the Conifer Mountain subdivision, north of 285, climbs to roughly 9,500 feet on the flanks of Berrian Mountain, whose summit is 9,151 feet a mile from Aspen Park. The top of the subdivision is in the third band while the bottom is in the second.
That’s the Conifer problem in one sentence: the same street can need two different conversion kits. A furnace set up for Aspen Park is not necessarily set up for the top of Conifer Mountain. Before we quote, we check the elevation at the address, not the elevation of the town.
Rheem draws its lines in different places, and calls for a listed high-altitude kit at any installation of 5,000 feet or more. Lennox adds a second pressure switch above 9,000. Whichever brand is going in, part of the quote is knowing which of its thresholds your house is above.
Gas furnaces are rated at sea level. Manufacturers publish a derate for thin air: Trane’s product data holds the input rating to 2,000 feet, then takes 4% off for every 1,000 feet above that. Run that for Conifer and a furnace with 100,000 BTU on the nameplate delivers roughly:
| Location | Elevation | What a 100,000 BTU furnace actually delivers |
|---|---|---|
| Golden | ~5,700 ft | ~85,300 BTU |
| Conifer (community elevation) | 8,262 ft | ~75,000 BTU |
| Top of Conifer Mountain | ~9,500 ft | ~70,000 BTU |
A quarter of the furnace is gone before it’s lit. That’s why a Conifer home usually needs a bigger nameplate than the same floor plan in the metro, and why the number has to come from a load calculation at your elevation rather than from the label on the old unit.
Jefferson County uses a colder winter design temperature above 7,400 feet: −11 °F instead of −7 °F, with a summer design temperature of 90 °F instead of 95 °F. In Evergreen that line runs through the middle of town. In Conifer there’s no line to argue about. The lowest homes in the community are already above it.
So every Manual J we run in Conifer uses the colder set of numbers, and every furnace we size is sized to hold the house on a −11 °F night. Four degrees of design temperature is not a rounding error at this elevation; it’s the difference between a system that keeps up in January and one that runs all night and loses ground.
Conifer is the most propane-heavy town we serve. In the Census Bureau’s 2019–2023 survey, about one household in five in the 80433 ZIP reported propane as its main heating fuel, and another one in ten reported wood. Ferrellgas keeps a location right on US 285 in Conifer. Some of Conifer is on Xcel’s gas main and a lot of it isn’t, and there’s no public map that says which is which. A tank in the yard is a normal sight across the community.
Propane and natural gas are not interchangeable in a furnace. Propane needs different orifices and a different manifold pressure, so a natural gas furnace has to be converted before it will run correctly on a tank. Add the altitude conversion on top and a Conifer propane furnace can need two separate kits before it’s commissioned properly. We do both, and because the office is ten minutes from most of Conifer, we’d rather stop by and look at the tank, the regulator and the furnace than guess from the phone.
Wood is the other Conifer fuel, and we should be straight about it: we don’t service wood stoves or wood fireplaces. We service the gas fireplace, furnace or boiler that carries the house when the stove is cold, and we make sure a wood stove and a gas appliance in the same room aren’t competing for combustion air.
A propane conversion or an altitude setup in Conifer gets its own quote. Two kits, one kit or none depends on the furnace, the fuel and the elevation at your address, so there’s no flat rate to print here.
Most Conifer homes do not need central air conditioning. Conifer sits a thousand feet above Evergreen, where the average July high is already only 80 °F, and Jefferson County’s own code assigns the mountain areas a summer design temperature of 90 °F. There is very little cooling load at 8,000 feet, and a condenser is a large expense against a handful of warm afternoons.
What works in a Conifer home is usually a whole-house fan, because the nights up here cool off hard, or one ductless mini-split in the great room with the west-facing glass. One zone costs a fraction of the whole house, and that same head gives you heat in the shoulder season. The real summer complaint in Conifer is smoke, not heat, and that’s a filtration problem we cover below.
If you want central air, we’ll install it properly and size it for your elevation. But we’d rather tell you that you don’t need it than sell you a condenser.
The median Conifer home was built in 1986. That’s nine years newer than Evergreen’s median, and it tells you what’s failing now: original 1980s equipment on its second or third replacement, and 1990s and early-2000s furnaces reaching the end of their service lives all at once.
The lots are also different. Conifer Mountain was built out from the 1970s through the early 2000s on two-to-six-acre wooded lots, on septic and, for most, a private well. That matters for water heaters, because well water varies house to house. Sediment and hardness that a metro water heater never sees can shorten the life of a tank up here, and a yearly flush is worth more in Conifer than it is in Lakewood.
The heating systems run the full range: forced air, boilers feeding baseboard or in-floor radiant, and gas fireplaces doing real work rather than decoration. We service all of it. Hydronic work gets priced after we’ve seen it, because a 1980s Conifer boiler loop was usually built by whoever owned the house at the time.
Since January 1, 2026, Colorado’s HB23-1161 has required new furnaces and water heaters sold in the state to meet CDPHE’s NOx limits. For a Conifer buyer that adds a third test to the model list. The furnace has to pass the NOx rule and carry a documented altitude kit for 8,000 feet and up. If you’re on a tank, it also needs a propane conversion. The short list is shorter here than anywhere else we work, which is why a 2024 quote may name a model we can no longer install.
Every town in the foothills talks about wildfire risk. Conifer has the history. On March 26, 2012, a prescribed burn on Denver Water land south of Conifer escaped in 60 mph winds. The Lower North Fork Fire burned 4,410 acres, destroyed 23 homes and killed three people. In July 2024 the Quarry Fire burned 579 acres and put 575 homes under evacuation. Elk Creek Fire, the district that covers most of Conifer, describes the area as one of the most dangerous wildland-urban interface districts in the country, and Jefferson County ranks the Evergreen/Conifer area first in Colorado for wildfire property-loss risk.
What that means for the equipment in your house comes down to smoke and vents.
Smoke gets in through the furnace. A 1980s furnace with a one-inch filter slot was never meant to filter wildfire smoke, and forcing a dense MERV 13 filter into it can drop the airflow enough to trip the limit switch. Where the blower can take it, MERV 13 is the right target; where it can’t, a media cabinet or a separate filtration unit is the honest answer. We’ll tell you which one your furnace is before you buy a case of filters.
Vent terminations are now a fire-code item. Colorado’s Wildfire Resiliency Code has been in force since July 1, 2025, and Jefferson County’s updated wildfire regulations, effective July 1, 2026, widened the county’s WUI boundary. Ember-resistant vent terminations are part of the hardening rules. Given Conifer’s history, we assume every address is inside the boundary and terminate vents accordingly.
Xcel Energy’s Public Safety Power Shutoffs can cut power to Conifer for hours or days on high-wind fire-danger days. No furnace or boiler runs without electricity. On December 17, 2025, about 52,000 customers across Jefferson and four other counties were shut off at 10 a.m. Xcel’s own restoration estimate was “a couple hours, or it could be a day or two.”
Blower, circulator pump, ignition: all three need power. A propane furnace on Conifer Mountain goes cold on a shutoff day just like a gas one in Aspen Park. What still runs is a standing-pilot gas fireplace. An electronic-ignition unit will not light without a battery backup. At this elevation a two-day outage in December is a frozen-pipe problem. If the fireplace is your backup plan, we’ll check which kind you have and make sure it can hold the house.
We don’t install standby generators in Conifer, and that answer comes from the office in town. Our mountain crew is heating, cooling and gas only. Generators are a metro service out of Golden.
Conifer has no town government, so every mechanical permit goes to Jefferson County’s Division of Building Safety. Permits applied for after July 1, 2026 fall under the county’s newly adopted 2024 IRC, IMC and IFGC, and electrical under the 2026 NEC from August 1. The county’s mechanical permit schedule starts at $45 for work valued up to $2,000, a re-inspection costs $100, and a homeowner may self-permit one dwelling in a 24-month window. We pull the permit as part of the job.
The fire side is more complicated than it looks. Most of Conifer is inside the Elk Creek Fire Protection District. In 2025 the neighbouring North Fork and Inter-Canyon districts combined to form Conifer Fire Protection District, and Elk Creek ended its own plan to join in November 2025. Two districts with Conifer in the name is confusing, and it matters for anything the fire district reviews. We check which one covers your address.
US 285 is the only way in and out, and when CDOT closes it in a storm, nobody gets up the hill from Golden. Off the highway, Jefferson County plows unincorporated roads in four priority tiers. Cul-de-sacs and dead-ends are tier four, and in mountain areas the county stops plowing between 9 p.m. and 3 a.m. Driveway approaches are the owner’s job.
The difference in Conifer is that our office is already on the hill. A service call to Conifer Mountain or Kings Valley starts on Conifer Road, not in Golden, and the trucks are the ones built for these roads. If your drive is long, north-facing or gated, say so when you call and we’ll plan the visit around it.
With the altitude kit on the truck, and the propane orifices if you’re on a tank.
Sized from a Manual J at your elevation and your fuel, not from the old nameplate.
Baseboard, in-floor radiant, and the 1980s loops that came with the house.
Repair and installation, with well water in mind.
Cleaning, inspection, repair, and shutoff-day setup.
Mini-splits and whole-house fans first; central air if you still want it.
Hydronic work, propane conversions and altitude setups are priced after we’ve seen the system. Request a quote and the Conifer crew will come out.
Almost always. The altitude derate takes about a quarter of the rated output at 8,262 feet, and Jefferson County’s −11 °F design temperature asks more of what’s left. A Conifer home ends up with a larger nameplate than the same floor plan in Lakewood, and the exact size comes from a Manual J at your address.
For Goodman and Amana furnaces, yes. Their 7,001–9,000 ft kit is different from the 9,001–11,000 ft kit, and Conifer Mountain crosses that line. We confirm the elevation at your address before ordering parts, because the wrong kit puts the furnace outside the manufacturer’s instructions.
Both exist here, and propane is more common in Conifer than in any other town we serve. A tank on the property means propane; an Xcel gas bill means the main. The furnace setup is different for each, so we check before we quote.
For most Conifer homes, no. The cooling load at 8,000 feet is small, and the nights do most of the work. A whole-house fan, or one mini-split in the room that gets the afternoon sun, is usually the right answer and costs far less.
All of it: Aspen Park, Conifer Mountain, Conifer Meadows, Shadow Mountain, Kings Valley, Pleasant Park, Richmond Hill, Oehlmann Park and the homes along the 285 corridor between them. If you have a Conifer address, our Conifer office covers you.
From Conifer. Our mountain office is at 26267 Conifer Road, Unit 209, in Aspen Park. That crew handles heating, cooling, water heaters and gas fireplaces. Generators, electrical and plumbing are metro services out of our Golden office.
It stops. Furnaces and boilers need electricity for the blower, the pump and the ignition. A gas fireplace on a standing pilot keeps running; one with electronic ignition needs a battery backup. We can tell you which kind you have and set it up to carry the house.
No. Our Conifer crew works on gas fireplaces, furnaces, boilers and water heaters. If you heat with wood part of the time, we make sure the gas side of the house is ready to carry it on the nights the stove goes out.
Jefferson County issues the mechanical permit for every Conifer address. Fire district depends on where you are: most of Conifer is Elk Creek Fire, and the North Fork and Inter-Canyon areas are now Conifer Fire Protection District. We check which one covers your address before any work the district reviews.
Call 720-470-1133 or request a quote online. Tell us your elevation if you know it and whether you’re on a tank, and we’ll bring the right kit the first time.
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You may also call us 24/7 at 720-470-1133.
