1870s rowhouse rehab energy efficiency – radiators and radiant heat?
I’m looking for feedback on heating and cooling (and energy efficiency) for a large, three story brick, italianate 1870’s row house (with low-sloping flat roof) – it’s attached to the neighboring brick house on the south, with a few feet between houses with the neighbor to the north). This is a big (4000 sq. ft), brick, main street structure with massive walls and many average sized (15′ x 15′) rooms that can’t be opened-up too much because of the existing structure. The building is basically already set up to have three studio apartments in the front of the building and a separate 3 story “townhouse” for the rear of the building (includes basement, 1st, 2nd at rear) – with side-by-side, central staircases dividing a long row house front/ back.
My basic heating / cooling plan (after gutting down to existing structure and leaving most of the walls) is to use
-an efficient natural gas boiler (suggestions?)
-PEX tubing going out to each individual radiator to adjust heat ?(suggestions?)
– refurbished cast iron hot water radiators (definitely)
– in-floor radiant heat throughout the basement floor (probably)
SHOULD I run the basement hydronic radiant heat (in concrete) off the same natural gas boiler heating the cast iron radiators? HOW?
Should I use any specific type of insulation or barrier in the sub-floor spaces? Should I use new-insulation over every original exterior wall and re-drywall over? I would be replacing the roof and having some skylights, cool roof of some type, and new insulation for the crawl spaces (suggestions on insulation?) I would be rehabbing the existing historic windows and adding simple storm windows
I would put on a minimal depth/ weight green roof and try to naturally ventilate above the existing stairwells with a basic solar chimney (to get natural ventilation and air movement as much as possible)
I would provide a central AC unit to each living area with an exposed air duct – (how should I design air output / intake?) The area gets hot and especially humid and stagnant and will not be appealing without air conditioning
I also need to replace the electric boxes (where it comes into the building) should I plan to re-wire the apartments that have modern wiring? (if it’s from the 70s?)
does this sound reasonable and cost-effective? I’m new at this – i realize most of the energy savings will come from window and door leaks, insulation, and not having an asphalt roof in full sun
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