Lots of rigid foam panels available new or 2nd hand if you look. Install 1" up to 2" rigid foam panel yourself. Take your time score snap tape it snug as a bug in a rug. Contractor will see you have it prepped and can do a good install with spray. They want a good surface to spray on so foam...
If your up on stairs or ladder in a radiant heated floor shop and its "cooler" there is probably no insulation or vapor barrier. Its just a drafty building with a heated floor. Probably same reason your swing days its uncomfortable because no insulation keeping heat out.
"and pricey to use. It will increase your bills."?
Not here. Natural gas fired boiler R48 ceiling R15 walls in a 32x56x14.5 been on since October set at 65* highest bills in $80's this winter. Quiet and comfortable. Cooler in summer too.
Hired 1" closed cell spray foam insulation on my 32x56x14'6"high metal building with dark brown roof and dark brown insulated OH doors, metal ceiling R-40 blown in cellulose. Cost around $3800. On 80 degree day, inside building is 7 to 8 degrees cooler with no fans. I nailed up 1.5" Owens...
did a 32x56x14'6". 40' wide would have been enough to turn stuff inside easier. 12' wide by 13' high gable end OH door I wish I would have made 16' wide maneuvering boat and equipment in and out. Side OH door 8'x8' to porch should have been at least 9' wide for pickups going in and out easier.
can't see how deep/thick your steel structure is ? Spray foam won't need vapor barrier than use steel panels for interior liner and you can attach to same structure as exterior steel attached to. Might need to make sure your ridge vent(my guess) is correct to keep out blowing rain(a lot of light...
Go with 14 or 16' wide at one end and at least 12' wide other end. With those great trusses you have put new header higher and go with overhead insulated doors. With the toys in your photo go with overhead doors. those sliders will not hold up for what I think you will be doing there. The wider...
Bill ending January 4th $ 82.00. shows avg temp for period 25*. Takagi boiler model T-H3M-DV 120,000 BTU Output temp set at 130* return is high 60's at start and middle 70's when stat satisfied. Flow rate 2.3-2.4 GPM. Distilled water/glycol mix closed system 1 zone.
I have same size building don't have build sheet until I get home end of week. am not an expert I hired mine. will send you pic of panel set up with equipment info.