The answer to 'replacement freezing up' is that a frozen air conditioner or heat pump is a common issue that can have several underlying causes. The most common reasons for a frozen replacement unit include low refrigerant levels, airflow blockages, or a malfunctioning component like the compressor or fan. Symptoms include ice buildup on the coils, reduced cooling/heating output, and the unit cycling on and off frequently.
In many cases, a frozen replacement can be fixed with some basic troubleshooting and maintenance. However, more complex issues like a refrigerant leak or compressor failure may require a professional HVAC technician to diagnose and repair. It's generally best to call for professional service if you're unsure of the cause or don't feel comfortable working on the equipment yourself.