Low refrigerant levels in a heat pump—caused by a leak in the copper tubing or fittings—exhibit several distinct and noticeable operational symptoms. One of the primary signs is that the system struggles to heat or cool your home effectively, resulting in long, continuous runtimes and lukewarm supply air. You may also notice ice or frost forming on the indoor evaporator coils or outdoor coils during improper operating conditions. Hissing or bubbling noises near the refrigerant lines often indicate escaping gas. Furthermore, you will likely experience a significant increase in your monthly utility bills as the compressor works overtime without achieving target temperatures. You can verify low refrigerant by having a licensed technician measure system operating pressures and check for leaks.
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