90° by Day, 55° by Night: How to Stop the Thermostat Tug-of-War in Colorado Springs

If you live along the Front Range, late summer weather comes with a familiar daily ritual: running your air conditioning on full blast during a scorching 90°F afternoon, only to reach for a fleece when overnight lows plunge into the mid-50s.

These dramatic 30-to-35-degree daily temperature swings create what we call the “Thermostat Tug-of-War.” When outdoor conditions fluctuate this quickly, your heating and cooling equipment can end up fighting itself—driving up energy bills and causing unnecessary wear and tear.

Here is how to set your home up for maximum comfort and efficiency during Colorado Springs’ swing season.

1. Watch Out for the “Auto Mode” Trap

Setting your thermostat to “Auto” (where the system automatically switches between heating and cooling) sounds convenient, but without the right settings, it can waste significant energy.

• The Problem: If your cooling setpoint is 72°F and your heating setpoint is 70°F, your system only has a 2-degree cushion. On a brisk 55°F night, the furnace kicks on to warm the house. As soon as the sun hits your windows at mid-morning, the AC kicks in to cool down the heat the furnace just produced.
• The Fix: Maintain a deadband spread of at least 4°F to 5°F (for example, cool to 75°F, heat to 68°F), or switch modes manually instead of leaving it on automatic changeover.

2. Take Advantage of “Free Cooling”

With nighttime lows dropping into the 50s, you have natural air conditioning right outside your door:

• Evening (8 PM – 7 AM): Once the outside air drops below your indoor temperature, open windows on opposite sides of the house to create cross-ventilation.
• Morning (by 8:30 AM): Close and latch all windows, and draw south- and west-facing blinds before the high-altitude sun begins heating up your interior. Trapping the overnight cool air delays when your AC needs to turn on in the afternoon.

3. Avoid the Temptation to Overcool

At over 6,000 feet of elevation, thinner air holds less heat and moisture. When you crank your thermostat down to 68°F on a 90°F afternoon, your AC’s evaporator coil operates at a much higher risk of freezing over.

• Target Range: Aim for 74°F–78°F while you are home and awake.
• Airflow Check: Ensure your air filters are fresh. A dust-clogged filter restricts airflow across the coil, accelerating freeze-ups during afternoon peak demand.

Take Control of Your Comfort

Optimizing your system for Colorado’s unique climate is easy with the right setup. Whether you need help programming a smart thermostat, balancing your airflow, or scheduling an end-of-summer tune-up, our NATE-certified technicians at High Altitude Heating and Air are here to ensure your system runs smoothly through every season.

Contact High Altitude Heating and Air Conditioning today to schedule your system checkup!