We recently came across the City of Longmont’s article, “10 Great Places to Cool Off in Longmont This Summer,” which includes everything from the mist sprayer at Lanyon Park to the mature tree cover at Collyer Park. It reminded us that getting through the hottest weeks doesn’t have to mean sitting beside the thermostat and watching the temperature rise.
Our first recommendation will surprise absolutely nobody coming from an HVAC company. Make sure the air conditioner works properly before Longmont settles into a run of high temperatures, and we’ll get to that, including a few signs the equipment may need professional attention. But we also compiled the other strategies we use, recommend, or have learned from living through Colorado summers ourselves. Longmont has identified extreme heat as its greatest climate vulnerability among the risks it has evaluated, and the city reports that local electricity use reaches its highest point during summer. The AC carries most of the cooling load, but how a household manages windows, appliances, rooms, and daily schedules can make its job a lot easier.
1. Use the Coolest Part of the Day While You Have It
Colorado mornings give us an advantage that hot, humid climates don’t always get. Even after a difficult sweaty afternoon, the temperature can fall enough overnight to make outdoor air tolerable again for a few hours. Check the forecast and air quality first, and when both cooperate, open windows early and place a fan where it can pull cooler air through the house. Opening windows on opposite sides creates a cross-breeze, while a window fan facing outward on the warmer side helps remove indoor heat.
Once the outdoor temperature starts approaching the indoor temperature, close the windows and coverings. That last step matters more than people think. Leaving windows open because the breeze still feels pleasant can undo an hour of work, since the house has already collected the cooler air and now needs to keep it there. The City of Longmont recommends using fans during cooler morning and nighttime hours, and it reminds residents to check outdoor air quality before bringing that air inside, particularly during wildfire season.
2. Give One Room Preferential Treatment
A whole house rarely cools evenly. Upstairs bedrooms, west-facing additions, and rooms above garages commonly hold more heat than lower spaces on the north side. Rather than expecting identical temperatures everywhere, we like choosing one room as the dependable afternoon retreat. To maximize your cool space:
- Close its shades before direct sunlight reaches the glass
- Add a ceiling or portable fan
- Bring in the dog bed, charging cords, books, water bottles, and anything else the household will need later
The point isn’t to shut every vent in the rest of the house, which can disrupt airflow. It’s to use the naturally cooler portion of the home more deliberately. A ceiling fan helps more than people realize, provided someone’s in the room. The U.S. Department of Energy reports that using a ceiling fan with air conditioning may let homeowners raise the thermostat by about four degrees without losing comfort, since fans cool people through air movement rather than lowering room temperature.
3. Build an Afternoon Route Through Longmont
The City’s cooling article gave us the idea for a local afternoon circuit. Instead of waiting until the house becomes uncomfortable, schedule errands and activities during the two or three hours it absorbs the most heat. Return library books and stay awhile, move a work-from-home afternoon to a cafe, visit the Longmont Museum, use the Recreation Center, or stop at Lanyon Park’s mist sprayer when the temperature allows for a short outdoor visit. The City specifically recommends air-conditioned public buildings such as libraries, museums, and recreation centers during periods of extreme heat.
You can plan several stops without leaving a car to bake in a parking lot each time, too. Ride Free Longmont provides unlimited trips on local routes 323, 324, 326, and 327 without requiring a fare, pass, or identification, though it’s worth checking current schedules before heading out in case construction or service changes affect a stop.
This works especially well for people who spend the day at home. Two hours at the library gives the cooling system time to gain ground, and nobody’s opening the refrigerator, running electronics, or adjusting the thermostat every fifteen minutes.
4. Deal With Western Windows Before the Room Feels Hot
West-facing rooms can stay comfortable until early afternoon and then quickly become the warmest part of the house. By evening, the glass, floor, walls, and furniture have absorbed enough heat to keep releasing it long after direct sunlight has moved away.
Close the coverings before noon rather than waiting until the room feels warm. The Department of Energy recommends blinds, curtains, or shades on southern and western windows, since blocking direct summer sunlight reduces radiant heating and lowers the cooling load. Exterior solutions work even better because they stop sunlight before it passes through the glass at all. Think solar screens, an awning, exterior shutters, a covered patio, or a properly placed mature tree, though those take more time and planning.
For an immediate improvement:
- Close west-facing shades before the strongest sunlight arrives
- Use cellular or lined shades instead of relying only on thin curtains
- Keep upholstered furniture a few inches away from hot glass
- Avoid placing lamps, televisions, or other heat-producing electronics near the thermostat
- Leave the room darkened until the sun clears that side of the house
Closing the shades during a bright Colorado day can feel counterintuitive. On record-temperature afternoons, the view can wait a few hours.
5. Cook Tomorrow’s Dinner This Morning
Advice about avoiding the oven helps until dinnertime arrives and nobody prepared an alternative. We handle this by moving the cooking schedule. Roast vegetables, boil pasta, cook grains, or prepare chicken in the morning while the windows are still open, and make enough for more than one meal so you can reheat it briefly or serve it cold the next day.
A countertop pressure cooker, slow cooker, or air fryer oven generally adds less heat than a full-size oven, and an outdoor grill keeps that heat outside entirely, provided local fire restrictions and safe clearances allow it.
Cold meals can be more than salad:
- Chilled sesame noodles or grain bowls
- Rotisserie chicken with vegetables
- Hummus plates and substantial sandwiches
- Gazpacho and tacos built with ingredients cooked earlier
Longmont’s heat guidance recommends shifting cooking, dishwashing, and laundry away from the hottest part of the day, so the dishwasher and dryer belong on that same evening schedule.
6. Let the Basement Change Jobs for a Week
Many Longmont basements spend most of the year holding guest beds, storage boxes, and exercise equipment. During a heat wave, the lower level may be the most comfortable living space in the house. Move movie night downstairs, set up a folding table for meals or puzzles, or work from a basement guest room instead of the upstairs office.
This requires no permanent renovation. It just recognizes that the house already contains different temperature zones. Check for moisture and radon concerns before turning an unfinished basement into a regular living area, but in a dry, finished lower level, moving more of the household routine down there for a few days beats fighting the thermostat all week.
7. Reserve a Small Piece of the Freezer for People
Most freezers hold food nobody remembers buying and at least one container nobody feels confident opening. During the hottest weeks, claim one shelf for practical cooling instead:
- A few reusable cold packs, wrapped in a thin towel before use
- Damp washcloths frozen in individual bags, good for the back of the neck after yardwork
- Insulated bottles filled partway, frozen upright, then topped off with water before you leave the house
- Chilled fruit and plenty of ice, since the refrigerator’s ice maker rarely keeps pace with everyone
None of this lowers the temperature of the house. It just makes the people inside more comfortable without another trip to the thermostat. Cold cloths also serve a more serious purpose during heat illness. The CDC recommends moving someone with suspected heat stroke to a cool area, calling 911, and cooling the person quickly with cold water, wet cloths, or ice while emergency help arrives.
8. Choose Shade Carefully and Reschedule Outdoor Work
Not every shaded spot feels cool. A young tree beside a large parking lot may block direct sunlight while the surrounding pavement keeps radiating heat. Mature tree canopy over grass usually creates a more useful break. Collyer Park offers established trees and shaded seating, while Lanyon Park has a mist sprayer near its playground and seating areas. The City included both in its list of local cooling options.
Even so, we’d still choose early morning or evening for a park visit during severe heat, bring water, and leave when the temperature becomes uncomfortable. Air conditioning remains the most effective protection during extreme heat, so a shaded park should serve as a short outing rather than a substitute when dangerous conditions develop.
The same scheduling principle applies to yardwork. Late afternoon may feel like the most convenient time to mow, weed, or work on an outdoor project, but it overlaps with the day’s highest temperature and the accumulated heat radiating from pavement, walls, and soil. Move outdoor work to early morning instead. Break large projects into shorter sessions, build in water and cooling breaks before anyone begins feeling unwell, and postpone nonessential work when nighttime temperatures stay high, since the body has less chance to recover.
Heat exhaustion can cause headache, nausea, dizziness, weakness, thirst, and heavy sweating. Heat stroke may cause confusion, slurred speech, seizures, or loss of consciousness and requires immediate emergency treatment. The CDC notes that body temperature during heat stroke can reach 106 degrees or higher within 10 to 15 minutes.
9. Give the AC the Best Conditions You Can
Everything above can reduce heat entering the house and make the people inside more comfortable. None of it can make up for an air conditioner that’s lost capacity or developed a mechanical problem.
When we talk with homeowners about Longmont AC maintenance, we look for the small conditions that force the equipment to work harder. A dirty filter restricts airflow, cottonwood debris around the outdoor condenser interferes with heat transfer, and a dirty coil, a weak capacitor, or a refrigerant problem can let the unit run for long stretches while producing less cooling. Longmont uses more electricity during summer than at any other time of year, so efficiency problems get more noticeable when thousands of cooling systems run through the hottest part of the day. The City recommends replacing dirty filters and offers home energy assessments through Efficiency Works to help residents find other improvements.
Ductwork deserves attention too. The Department of Energy reports that proper duct sealing can cut utility costs by as much as 20 percent, since leaking ducts force the system to run longer to deliver the same comfort.
Before the hottest weather hits:
- Inspect or replace the filter
- Remove leaves, cottonwood fluff, and stored items from around the outdoor unit
- Make sure furniture and rugs aren’t blocking supply or return vents
- Check that the thermostat reads accurately and sits away from direct sun or heat-producing electronics
- Pay attention to unusually long cycles, abrupt starts, and changes in sound
Warm air from the vents, frequent cycling, tripped breakers, new noises, or a home that can’t reach the thermostat setting may all signal a need for Longmont AC repair. The system doesn’t need to stop completely before it has a problem. A unit can keep running while a failing component quietly reduces performance and drives up operating costs.
When repairs become frequent or the system no longer handles ordinary summer conditions, an evaluation for Longmont AC installation should factor in the house as well as the equipment. Correct sizing depends on square footage, insulation, windows, air leakage, duct condition, and solar exposure. Swapping an old unit for a bigger one without calculating the home’s actual cooling load can create new comfort and efficiency problems instead of solving the old ones.
The air conditioner should carry the largest part of the work during a run of record temperatures. Morning ventilation, window coverings, cooler rooms, and shifted household routines lighten the load. Starting with a well-maintained cooling system gives all of those smaller ideas a real chance to help.
Know Who to Call When the House Won’t Cool Down
Even the best-prepared home reaches a point where morning air, closed blinds, and a well-organized freezer aren’t enough. If the air conditioner is running constantly, cycling strangely, or simply can’t keep up with a Longmont heat wave, that’s a sign the equipment needs a closer look rather than another workaround.
Stone Heating and Air has spent years helping Longmont homeowners get through the hottest stretches of summer, whether that means a same-day repair, a maintenance visit before the heat arrives, or a full system evaluation when an aging unit can no longer keep pace with the house it’s cooling. Extreme heat isn’t going away, and a home cooling strategy works best when it pairs good daily habits with a system that’s actually equipped to handle Colorado summers.
If your AC has you second-guessing whether it’ll make it through another 100-degree afternoon, reach out to Stone Heating and Air before the next heat wave arrives. A quick inspection now can save a much less convenient breakdown later.