Extreme Heat risk in Colorado

A Denver closing date in July

You're standing in the driveway of a 1970s ranch house in Denver's Harvey Park neighborhood. It's 6 p.m. and still 97 degrees. The inspector says the attic has a ridge vent but no intake vents, and the central AC is original to the house. Your closing date is August 15. Welcome to extreme heat risk in Colorado. The state's overall rating is a 3 out of 5. That's moderate, but it's not nothing.

What actually happens to a house

Colorado's heat is dry, but it's still brutal. On the Eastern Plains, in Pueblo, and out in Grand Junction, summer highs often push past 100. The Front Range from Fort Collins down to Colorado Springs gets its share of 95-plus days, and Denver's urban heat island keeps nights warmer than the surrounding prairie. In Weld County and Mesa County, the same pattern holds. That matters because most of Colorado's housing stock wasn't built for it. A lot of homes built before 1990 don't have central air conditioning. Even newer ones can struggle when the temperature stays above 90 for a week.

What happens? Attics turn into ovens. Without proper intake and exhaust ventilation, attic temps can climb past 140 degrees—hot enough to cook the underside of your roof deck, warp shingles from below, and shorten the life of any HVAC equipment up there. Your AC runs nonstop, which means higher electric bills and a higher chance of a mid-July breakdown. If you have a heat pump, it works harder too. In El Paso County and along the I-25 corridor, the combination of altitude and sun means UV rays are stronger. That's hard on exterior paint, deck boards, and window seals. A south-facing wall can get scorching on a July afternoon. You'll see paint peeling and caulk failing faster than in milder climates.

Insurance reality: your standard homeowners policy does not cover heat-related wear and tear. Shingles that blister or age faster because of heat? That's maintenance, not a claim. AC breakdown? Not covered unless you bought equipment breakdown coverage. If a heat wave causes a power outage and your food spoils, you might get a few hundred dollars under a food spoilage endorsement, but it's not automatic. And if your home becomes too hot to live in, loss-of-use coverage usually only kicks in if the damage is from a covered peril like fire or wind. Heat alone rarely qualifies. So you're mostly on your own for the cooling upgrades that actually protect your house.

If you only do three things

If I had one weekend and a few hundred dollars, I'd start with attic ventilation and a window AC for the room where you sleep. Here's the short list.

• Check your attic. If you have a ridge vent but no soffit vents, you're pulling almost no air. Add intake vents or a solar-powered attic fan. That one change can drop attic temperatures a lot.
• Get a window AC or portable unit for one room. In a Colorado house without central air, cooling one bedroom is cheaper and more reliable than trying to cool the whole place. Look for an Energy Star unit.
• Know your backup plan. If you have a medical condition or you're on medications that affect heat tolerance, find a cooling center or a friend with AC. Ready.gov has a list of what to pack in a go-bag for heat.

If you're handy, a whole-house fan is a Colorado classic. It pulls cool night air through your windows and pushes hot air into the attic, where it exhausts. But it only works if your attic has a way to let that air out.

Questions we get

Does homeowners insurance in Colorado cover heat damage?

Usually no. Heat damage is considered gradual wear and tear. A cracked shingle or a dead AC compressor from overwork isn't a sudden accident. Some policies offer equipment breakdown coverage as an add-on, but it's not standard. Read your exclusions. That said, if a fire starts because of heat-related electrical failure, that's a different story. Fire is covered.

How hot does it actually get in Colorado?

It depends on where you are. Grand Junction, Pueblo, and the Eastern Plains regularly see 100-plus. Denver gets a handful of 100-degree days most summers, but the bigger issue is consecutive 90-degree days. The Western Slope can be even hotter. The National Weather Service has heat safety tips at weather.gov/safety/heat.

What's the cheapest way to keep a Colorado house cool?

Shade and ventilation. Exterior window shades, awnings, or even reflective window film cut solar gain. A whole-house fan can pull cool night air through the house. And if you have a basement, use it. That's the old Colorado trick. Also, don't forget that ceiling fans cool people, not rooms. Turn them off when you leave.

Where to verify this

You don't have to take my word for it. Here are the official sources.

• Colorado Division of Homeland Security and Emergency Management
• NWS Heat Safety
• Ready.gov – Extreme Heat
• CDC – Extreme Heat

You can also check FEMA's National Risk Index for your county. But start with those.