The fan on the outside heat-pump unit stopped working. A local HVAC tech diagnosed a faulty pressure switch. He advised that due to the age of the system the $400 cost to replace the switch would not be economically wise. His repair was to bypass the switch to keep it running. He said if it were his house that is what he would do even though it could eventually cause a compressor failure and the entire unit will have to be replaced. Spending $400 now would not be a major burden but if the system is really near the end of its life expectancy would it be wise? Should we have the switch replaced or just continue with the bypassed switch and save the money and consider a system that may be more efficient in our Missouri climate? We will probably live in the house for three more years.