While I'm here getting trouble shooting advice on my boiler, might as well ask about my summer project. The house is located in New Hampshire so I was entertaining installing g a multi split heat pump to cool and augment the oil fired boiler. Not sure how practical using it for heat up here is, still looking into that. Its just my GF and I so the second bedroom is used as an office so she can work from home when needed. House is a 1100sf ranch. According to online calculatiors I need between 18,000 and 24,000 BTU total. The vaulted area and kitchen has windows over all the outside walls. The vaulted area and kitchen combined is about 500sf and the main bedroom is 200sf. My thoughts were either a 6+15k on locations 1&2 or a 6+6+12 for 1,2&3. Any I put on how far off base I am?

So my neighbor put a new unit in and it's vibrating and driving us crazy (we're on the top floor; he's below us). It's a ThermalZone unit. He's had various AC people come in and try to get it to stop vibrating through our apartment but we're not having too much luck. The last AC guy said he thinks the problem is the AC stand is placed on support planks, and if the unit was moved to an area of the roof (like over the living room) with a little more give it would probably be better. So 3 separate questions: 1. Does that sound like something we should try? It's 180 lb unit and I'm worried without support it could fall through at some point. It's a 60-year building that doesn't really have the best construction. 2. Before we do something that drastic I was thinking of rigging together a platform underneath the unit (23 inch clearance) with a rubber or vibration pad top that pushes up against the unit to see if distributing the weight more makes it any better. Does this sound like a particularly crazy plan? It wouldn't carry the whole weight, just push up enough to carry some of it. If it sounds like something that might work, does anyone know of a way to make sure it pushes up enough? The unit is bolted to the stand so there's no way to lift the unit up and place it on the platform. I was thinking of using some sort of jack, but I don't think jacks are meant to lift things permanently. Are there any kinds of extendable legs that act as a jack in that way? 3. Would heavily insulating my ceiling possibly fix this? I don't mind getting that done on my own expense because it will also help with keeping the place cool (this is in South Florida), but I don't want to do it unless it helps with the vibrations, too.