Elevation Heating and Air

With technology constantly changing and the EPA staging out R22 I would recommend to start saving for a new unit. There are " drop in" Refrigerants that are still costly but it will save you so much money in the long run to update to the newer units with higher SEER ratings

The answer is in the question. To find upcoming issues before you are without heating or cooling. Changing filters regularly, coil cleaning, and checking the unit safeties could save you a lot of hassle down the road. It is always better to be proactive than reactive