We bought a house a while back, and part of the deal was to fix the air conditioning unit (heat pump), on the advice of our home inspector.
The outside unit was replaced, and it is physically quite a bit larger than the previous heat pump. (I couldn't find any performance information on the stickers, just part numbers, and I plan to look that up tomorrow.)
Fast forward to now: Spring has arrived (Northern Kentucky), and the house is in the low to mid-80's inside with the air conditioner on.
I've been doing some homework, and think I understand the components better now (compared to when we bought the house.)
I took the panel off of the air handler unit (located in our basement), in order to have a look at the evaporator coil. The coil has rust on the copper tubing, and it looks like the fins are dirty on the inside (it is hard to get a good look though.)
Notably, the air blows considerably harder through our vents with the panel off of the air handler - I assume that this is a sign that the evaporator coil is "dirty"?
I also wonder if there might be a refrigerant leak, as the big copper intake tube does not feel very cold at all.
Having said that, I have one important question, as this pertains to whether the people who installed the new heat pump did their job right:
1. Everything I've read in the last couple of days says that you should replace the evaporator coil unit at the same time you replace the outdoor condenser / heat pump. The installers did NOT do this - they just replaced the heat pump. SHOULD they have replaced the evaporator coil? Is there a strong enough reason to do this that I would be justified in demanding that they replace it now?
2. I've also read that it is important that the evaporator coil must be carefully matched in size to the condenser / heat pump. Unfortunately, neither of my units have any performance information on them, but I do have the model numbers, and so I will try to find that information out soon. But, I can tell you that the new heat pump is considerably larger (physically, at least) than the old one. Assuming that the new one is (significantly?) larger (in capacity) than the old one, and that the existing evaporator coil was in fact matched to the old, smaller, heat pump - does this also justify me in demanding that they (the installers) replace the evaporator coil with a new (matched) unit?
When we bought the house, I didn't understand how the whole heating/cooling system really worked. They said they would replace the heat pump, as the old one was making strange sounds. However, it would seem to be a bit negligent to blindly hook up a larger heat pump to an old (rusted & dirty) evaporator coil. If this is the case, I'm also concerned that this may affect the life of the new heat pump (being mismatched.)
Anyway, I would appreciate any comments on this, particularly on what the installers _should_ have done (if different), as well as any suggestions on what to do next.
Thanks for any help!