Heat Pump Won't Heat in McKinney, TX? What Collin County Homeowners Should Check This Fall
If you own a home in McKinney, Frisco, Allen, or Plano, there is a good chance your HVAC system is a heat pump. Collin County's newer subdivisions were heavily spec'd with heat pumps because they are efficient in the mild-to-warm climate North Texas usually sees. That works out well nine months out of the year.
Then October arrives, overnight lows dip into the 40s, and a lot of Collin County homeowners flip the thermostat to heat for the first time since spring, only to find the system blowing lukewarm air, running nonstop, or not heating at all. If your heat pump won't heat in McKinney, TX, this post is for you.
Why Heat Pumps Struggle in the Fall Transition
A heat pump does not generate heat the way a furnace does. Instead of burning gas, it moves heat. It pulls thermal energy from the outside air and transfers it inside. In moderate temperatures this is highly efficient. As outdoor temperatures drop, there is less heat in the air to extract, and the system has to work harder.
In McKinney and the rest of Collin County, fall looks mild on paper. But we get cold snaps. A night that drops to 38 degrees is not unusual in mid-October, and that is right where a heat pump with a dirty coil, low refrigerant, a failing reversing valve, or a weak defrost cycle starts showing its problems.
Add in the fact that most systems in Frisco and Plano ran hard all summer cooling a house in 105-degree heat, and you have equipment under real stress heading into a season where it needs to run in reverse.
Common Reasons Your Heat Pump Won't Heat in McKinney TX
When Collin County homeowners call us in October and November about a heat pump that isn't heating, the issue usually falls into one of a few categories:
The reversing valve is stuck or failing. This is the component that switches the system from cooling to heating. When it sticks, the system keeps pushing cool air even with the thermostat set to heat. This one needs a technician.
Low refrigerant charge. A system with a slow leak can cool adequately in summer but struggle to heat once outdoor temps drop.
A dirty or blocked outdoor coil. In heating mode the outdoor unit is your heat exchanger. Cottonwood debris, grass clippings, or a summer's worth of grime cut heat transfer significantly. Sometimes a good coil cleaning is the fix.
Defrost cycle problems. Heat pumps frost over in cold weather, and that is normal. When the defrost board or sensors fail, ice builds up and the system loses heating capacity quickly.
Auxiliary heat not kicking in. Most heat pumps have backup electric strips for cold days. If they have failed, the heat pump alone may not keep up below about 35 degrees.
What You Can Check Before Calling a Technician
Before you schedule a service call, run through these steps. We have helped McKinney and Allen homeowners get heat back over the phone with some of them:
Check the thermostat. Make sure it is set to HEAT, the temperature is above the current room temperature, and the fan is on AUTO.
Replace the air filter. A clogged filter restricts airflow and can trip a safety limit. If yours has been in since May, pull it out now.
Look at the outdoor unit. A little frost is normal. A solid block of ice means the defrost cycle has failed. Do not chip the ice off. Call a tech.
Check the breaker panel. Heat pumps often have two breakers, one for the air handler and one for the outdoor unit. Check both.
Note what the system is doing. Is the outdoor unit running at all? Blowing cool air? Short cycling? Each tells a technician something different.
Why Fall Is the Right Time for a Heat Pump Tune-Up in Collin County
Here is the honest case for a fall tune-up: mid-October is the best window you have all year to catch a heating problem before it becomes an emergency. Daytime temperatures are still mild, so a day or two without heat is not a crisis. That flexibility disappears once November cold snaps get more serious.
During a heat pump tune-up, a technician checks refrigerant and looks for leaks, tests reversing valve operation, cleans the outdoor coil, tests the defrost board and sensors, verifies the aux heat strips, checks capacitors and electrical connections, calibrates the thermostat, and measures airflow. It covers what commonly fails, before it fails.
For homeowners in Frisco, Plano, and Allen who have been in their house five or more years, this is especially worth doing. We also serve Grayson County, including Sherman, Denison, Whitesboro, and Gainesville, so if family or neighbors up north have the same questions, we cover both counties.
We are a family-owned, veteran-owned HVAC company based in Whitesboro, TX. We work on heat pumps every day. Our service call is $89.99, we are available 24/7 for emergencies, and we will tell you honestly what we find.
If your heat pump won't switch to heating mode, is blowing lukewarm air, or you just want someone to go through it before the weather turns, call Air Done Right Mechanical at (940) 783-6017. We serve all of Collin County, including McKinney, Frisco, Allen, and Plano.
