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You sure there is not a removable panel on the tub itself? There had to be some way for the plumbing connections to be made when the home was built.

Sounds like he is just not interested in the work. Walls caving in? Maybe if they removed the whole roof, including trusses, at once, but they're not going to do that - unless you specified a shingle roof, then they may have to upgrade everything to handle the extra weight. Maybe that is what he was...

Well, you have received advice from several people, some homeowners and some professional service people, and you have dismissed all of it. If you will not actually TRY something, I guess it is time to abandon this thread and move on.
Good Luck.

So your furnace is running only 4 minutes on/15 minutes off? That is only on 16 minutes of each hour, which doesn't seem like much. Mine runs for 7-10 minutes at a time, then is off for 10-20 in cold weather. How much propane do your neighbors use in comparison? I know propane is more costly than na...

Just use a regular digital camera. If you don't have one, see if a neighbor will loan you one. The pics can then be loaded on to your computer, so you don't need to buy a camera. You can then upload the pics to some place like photobucket, and post the links here. Remove the vent grille from the flo...

I still think you have to be losing heat through the duct work somewhere. Before my furnace was upgraded, the room adjacent would be unbearably hot with the door closed. Now it is the same temp as the rest of the home. The farthest room does get the least airflow through the vent, but it is sufficie...

You're not going to accomplish anything by coating the shingles. They will be difficult to coat, you will not be able to seal leaks on shingles with a coating, and anything you manage to put on them will not last long. Save your money for a proper re-roof. Go with a lighter color shingle or metal. I...

I switched from a dark brown shingle to light brown, and it made a significant difference in the inside temp. Also, during tear off, I found that my felt paper was wax paper sprayed with a thin asphalt coating. Replacing with proper felt and quality shingles also cut the noise level from rain. I hav...

Do you have access to a digital camera? You could put one down through the floor registers and take some pictures, looking each direction from two or three registers, to see what is going on, and answer the duct separation questions.

Then you should get helped with the most up to date guidelines. Unfortunately, if you have the very thin exterior walls, there is just no easy way to add insulation to them. From what you describe your furnace airflow to be like, I'd guess the duct work is disconnected somewhere underneath, so you a...

I think the programs have changed in recent years.
Are you going through a state agency for weatherization?

Ouch! Do a search in your area for any weatherization programs out there. There are income based gvt programs to assist you. As an example, we received an energy audit through an agency here. They did an air infiltration test, checked our furnace, water heater, refrigerator, and replaced all light b...

Maybe the new windows/doors eliminated some air infiltration (drafts,) resulting in less air exchange. This could cause humidity to build up in the home. I would think a vapor barrier would be a good idea. Also use the bathroom vent fans, range hood, etc., as needed to reduce humidity.

And yes. you can plumb in an overflow. I found a 54" steel tub at a local store.