As the seasons change in Missouri, your home comfort system needs to adapt. At Schraer, we know many homeowners aren’t sure exactly when—or how—to transition from heating to cooling. If you’re preparing for warmer weather and thinking about AC in Warrenton, spring is the perfect time to make sure your system is ready for a smooth changeover. Switching properly helps protect your equipment, improve efficiency, and keep your home comfortable as temperatures rise.
Below, we’ll walk you through the safest way to transition a typical Missouri split-system from furnace heating to air conditioning.
Why the Seasonal Switch Matters
Most Missouri homes use a split system in which the furnace handles heating, and the air conditioner uses the same ductwork and blower to deliver cooled air. Because these components share parts of the system, switching modes correctly helps prevent unnecessary strain on the blower motor, thermostat controls, and electrical components.
Taking a few simple steps before turning on the AC can help prevent early-season breakdowns and keep your system running efficiently all summer long.
Step 1: Choose the Right Timing
Missouri spring weather can be unpredictable, so timing matters. We generally recommend waiting until overnight temperatures consistently stay above the mid-40s before switching to cooling mode.
Running the AC when outdoor temperatures are too low can cause pressure imbalances in the system and reduce efficiency. A steady stretch of mild nights and warmer days signals it’s time to transition.
Step 2: Turn Off the Heating at the Thermostat
Start by switching your thermostat from HEAT to OFF for a short period. This brief pause allows the furnace system to fully shut down and ensures there’s no overlap between heating and cooling cycles.
After a few minutes, switch the thermostat to COOL and set your desired temperature slightly below the current indoor temperature to test the system.
If your thermostat uses programmable schedules, this is also a good time to update them for warmer weather.
Step 3: Replace the Air Filter
Before the AC starts working harder, install a clean air filter. During winter, filters often collect dust and debris from months of furnace operation.
A fresh filter improves airflow, protects the evaporator coil, and helps your system cool more efficiently. We typically recommend checking filters monthly and replacing them every one to three months, depending on household conditions.
Step 4: Check the Outdoor Condenser Unit
Your outdoor AC unit may have collected leaves, dirt, or debris over the winter. Take a few minutes to inspect the area around it.
Clear away any debris and make sure there’s at least two feet of open space around the condenser. Good airflow around the unit allows it to release heat properly and maintain efficiency.
Also, confirm the disconnect switch near the unit is turned on if it was shut off during the winter.
Step 5: Run a Short Cooling Test
Once everything is ready, let the AC run for about 10–15 minutes. You should notice cool air coming from the vents and hear the outdoor unit operating smoothly.
Watch for any unusual sounds, weak airflow, or warm air coming from the vents. If something doesn’t seem right, it’s best to schedule a professional inspection before the hot Missouri summer arrives.
Step 6: Schedule a Seasonal AC Tune-Up
Spring is the ideal time for preventative maintenance. A professional tune-up includes checking refrigerant levels, cleaning coils, testing electrical components, and confirming your system is operating safely and efficiently.
Preventative service helps extend equipment life, lower energy bills, and reduce the risk of mid-summer breakdowns.
If you’re ready to transition your system or want a professional checkup, our team is here to help.
Schraer, bringing heating, cooling, and air quality comfort to our community since 1946.
636-456-5041