A heat pump not cooling on hot days is most often caused by restricted airflow, incorrect thermostat settings, or low refrigerant. A clogged filter or a dirty outdoor coil is the most common culprit because the system can’t move enough heat outside. We frequently see this during the first big heat waves, and one clue is the system runs a long time with little temperature drop. In our local work around Ellicott City, we also find defrost or drain issues that mimic cooling loss. If the outdoor unit is quiet or short-cycling, a tech should check refrigerant charge and electrical components. We provide straightforward pricing before work begins, and free estimates on system replacement when repair isn’t the right call.
Try these simple checks first:
- Set thermostat to Cool and Fan Auto, then replace the air filter.
- Clear leaves or lint from the outdoor unit and give it 2 feet of space.
- Look for ice on lines or hear loud grinding; if present, turn it off and call a pro.
- Note frequent temperature swings or sudden bill spikes to discuss during service. A quick shutdown to melt any ice and a scheduled diagnostic prevents damage and speeds a correct fix.
Updated: 2026-04-02
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