The answer to 'furnace repair freezing up' is that a frozen furnace is a common problem that can be caused by several factors, including a clogged air filter, low refrigerant levels, or a problem with the defrost cycle. Symptoms may include ice buildup on the coils, poor airflow, and reduced heating capacity.
To troubleshoot a frozen furnace, start by checking the air filter and replacing it if it's dirty. If the filter is clean, the issue may be with the refrigerant level or the defrost cycle. These problems are best addressed by a professional HVAC technician, as they require specialized knowledge and tools to diagnose and repair.