Hi I'm looking for some help regarding insulation and ac units in old homes.
Our house was built in 1891.
Before we moved in, the upstairs was cooled/heated by window units. We installed a new ac unit in the attic sometime after we moved in. 1st problem, they installed a 1.5 ton unit instead of a 2 ton unit which is what we apparently need. We've had issues with this unit starting a couple of years after it was installed. I've tried to convince my mum to have the unit taken out and replaced with the correct one but to no avail. Currently, it has been "fixed" but it stays blistering hot upstairs during the day. Long term - shouldn't we change to the 2 ton unit? Or will fixing other issues (insulation, windows) make this unit work better for us?
Also, when they opened up the attic to create space for the unit we also reinsulated up there. That was about 8 years ago. Since then, the insulation that was up there has disintegrated. I've read a few articles about spray insulation vs the regular pink insulation and have seen mixed opinions. We aren't looking to insulate anywhere else but the attic. Is it okay for a house this old, to use spray foam insulation? I want a solution that will last but I also don't want to affect the integrity of the house since apparently spray insulation can't be removed from the wood.
Also, our windows are very leaky so we will be adding storm windows to every window in the house to help with heat/cool air loss.
If anyone has any knowledge, articles, or links to other threads that would be helpful I would really appreciate it!