We had to have our 15y old heat pump filled with freon this a.m. to the tune of $175 and the repairguy wants to see how long it lasts to determine how big a leak there is and then he will come back find it and see if it can be repaired. I'm about to barf. Why does this stuff always happen before Christmas? We had to have a new blower motor last year about this time. So, does anybody have any wisdom to share? I know very little about heat pumps.TIA 
. Ours lasted about 20 yrs before we had to invest in a new one. Definitely a big investment, but gave us opportunity to upgraded to a larger Trane and it's been worth it. If things are really tight, you may look into a Home Equity for major improvements as such. Good luck!