Any opinions on replacing the reversing valve (currently hanging in cooling mode and sometimes halfway) on an older Carrier 2.5 Ton HP? The tech showed me how it would be done and admitted that they're not easy to do. He was thorough and checked everthing and said that the system otherwise had good numbers when he put the guages on it. He said he would probably go ahead and replace the accumulator due to the rust pitting on the connections, if he did it.
I do understand that with a twenty-two year old HP that it's a gamble, but I'd like to try and get a few years down the road here before replacing the system. Like when my truck is paid off (!) and my PMI drops off of my mortgage.
Any other considerations as far as the indoor or outdoor unit such as adding a thermostatic expansion valve? Thanks for any replies.