I'm in the process of getting quotes for hydronic radiant floor heating to
be added to my 1st floor of my 100 yr. old house. I live in NH and the
winters are cold and the woeful baseboards can not keep up.
I'm thinking heated floors would be a great addition for
comfort/convenience/efficiency/resale value.

My basement has full access and is cement floored. The floor joists are
accessible but are not all on 16" centers. The centers range from 13" to
22"! Damn old home builders! Makes insulating a little more difficult but
I'll manage. All of the exterior walls have blown-in insulation and all of
the windows are double hung, thermopane windows.

My oil-boiler is less than 20 years old and seems to be working fine (87%
efficiency according to last tune up).

Has anyone done this and regretted it? I'm sure it's expensive (probably
between $5k and $10k) but I'm really wanting to try this.

I would put up Reflectix insulation to reflect the heat back into the floor.
The latest technique seems to be hang the PEX tubing about 1" under the
subfloor, attached to the joists. Then insulate the hell out of it (R19) to
heat up the "pocket" of air between the joists and push it into the floor.

Then you set the thermostat to one temperature (68 or so) and leave it.
None of the turn-down-at-night-turn-up-in-morning scenario. Set it and
forget it.

I've been in a couple houses with this and I was instantly hooked! Warm
furniture, warm feet, generally a comfortable and cozy feeling.

With winter in New England last about 6 months (!) I figure I need to
upgrade to help be comfortable for half my life.

Thoughts/tips/tricks/caveats?

Thanks.