As outdoor temperatures climb, you may need to switch your HVAC system from heating to cooling mode. But most thermostats can't make that switch on their own, and the ones that do still rely on settings you may not have touched since last fall. With a few targeted adjustments, you can seamlessly transition from heating to cooling before the season starts, keeping your system efficient and your costs down.

Here’s how to prepare your thermostat for the coming months:

Review Your Current Settings

Your thermostat controls how your system responds to temperature changes. Before the season changes, confirm that these three settings reflect how your space is used.

Mode and Fan

Check that your thermostat is set to cooling, not heating. If your system uses a manual changeover, flip the selector to "cool" and the fan to "auto." A fan left on "on" circulates air continuously without cooling it and adds to your utility bill.

Temperature Range

Spring temperatures swing. Mornings can still sit in the low 60s, while afternoons push past 80°F. A starting range of 68°F to 74°F during occupied hours gives you room to adjust as conditions change.

Cooling Setpoint

Setting the thermostat to 60°F won't cool a room any faster than setting it to 72°F, since the system pushes air at the same rate either way. As a result, you end up overcooling the space and running up the bill. Set your cooling setpoint to match the actual comfort target for your space.

Inspect Your Thermostat and Surrounding Components

Thermostat settings for spring only work if your unit is reading the room conditions correctly. Dust on the sensor, a dead battery, corroded wiring at the base, or a lamp sitting too close can all throw off that reading. 

Before you run a cooling test, make sure you inspect the following components closely:

• Sensor and Contacts: Wipe the exterior with a dry cloth. Open the faceplate and use a short burst of compressed air on the sensor and contacts. During the heating season, dust builds up and can throw off the reading.

• Battery: Swap the batteries in any wireless or battery-backed unit. When the battery dies, the thermostat can lose its programming and fall back to a default that doesn't match your schedule.

• Wiring: Look at the terminals where the thermostat connects to the wall. Loose wires or corrosion on the contacts can interrupt communication with the system.

• Surrounding Area: Check what's near the thermostat. A lamp, a TV, or furniture against a nearby wall can radiate enough heat to skew the reading and keep the system running longer than it should.

Test Your Cooling System and Schedule Maintenance

Your thermostat should now be clean, powered, and reading the room accurately. The question is whether the cooling system itself responds the way it should. To test your HVAC cooling system:

• Run a Cooling Cycle: Set the thermostat about 5°F below the room temperature and let it run for 15 to 20 minutes. While it's running, listen for anything unusual at the air handler or outdoor condenser.

• Check Airflow at Each Register: Walk through the space and confirm that cool air is coming from each register. Weak airflow or warm spots may point to a clogged filter, a closed damper, or low refrigerant.

If the system isn’t responding correctly, it may be time to book a professional tune-up. A technician can check your refrigerant charge, service the coils and wiring, and address underlying issues.

Program a Seasonal Schedule

After confirming that your system is working, adjust your thermostat setting for spring to match how the space will be used through the warmer months. Here are some best practices to consider:

Daytime Settings

The U.S. Department of Energy recommends setting the thermostat to 78°F when you are home during summer and raising it by 7°F to 10°F when the space is unoccupied. That adjustment can reduce cooling costs by up to 10% annually.

Night Settings

Your body temperature drops during sleep. A bedroom range of 60°F to 67°F supports rest without forcing the system into frequent overnight cycles.

Commercial Schedules

For commercial properties, align the thermostat schedule with operating hours. If your building empties at 6 p.m., begin raising the setpoint 30 minutes before close rather than running at full capacity into the evening.

Know When to Replace Your Thermostat

The steps above assume your thermostat is functioning correctly. If it isn't, then you may need to replace it immediately. Watch out for the following signs: 

• Temperature readings that don't match actual room conditions

• A cracked or unresponsive display

• No programmable scheduling capability

• Frequent on-off cycling (short-cycling) or failure to trigger the cooling system

• Loss of communication with a building automation or energy management system (EMS)

A programmable or connected replacement thermostat lets you set time-based schedules and monitor how long the system runs each day.

Commercial Properties Require a Broader Review

Larger facilities often run zoned HVAC systems. Spring is the right time to confirm that each zone is responding to its thermostat, that damper actuators are cycling through their full range, and that return air sensors are reading accurately. Readings and positions shift over time, and small calibration errors in spring become larger performance gaps by August.

Find the Right Replacement Parts for Your System

Value Controls carries thermostats, controllers, sensors, and actuators for residential and commercial HVAC systems. All products, including used equipment, ship with a two-year warranty. If you need a replacement or have a compatibility question, contact our team, and we’ll be glad to assist you.

 

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Carrier Thermostats

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