The first question should be is your heat pump more than 10 years old? If it is, the likelihood of an expensive failure ($700 to $2,500, typically) has increased dramatically and often result in an extended down-time (3-5 days typically). Planned heat pump replacements are usually completed within eight hours. New heat pumps offer large savings on your electric bill and most come with a 10-year warranty. I believe that's called a "Win-Win".