adding radiant heat


I have a family room addition over a slab that is currently heated by a boiler unit. The register is perhaps 4-5 feet in length. Normally, its 6-10 degrees cooler in that room than the other rooms.
Here are a couple of variables to throw in.
I am adding a bedroom to the west of this room, thus this room will no longer be exterior on three sides, just two. A large and very leaky picture window unit is being replaced with a wall and a door leading to the new, well insulated bedroom. Four small (but older) window units will remain in the family room.
Will the fact that this room will be much better insulated from the west due to the new addition warm it up? My HVAC guy says its a colder room b/c the boiler register sits on an interior wall now.
I could get my electrician to wire an additional heater in this room for probably 300 bucks if he is here anyway running wire in the new addition.
On this cool morning (30F outside) it is 72 in the kitchen, and 66 in the family room. Maybe this is not a huge difference but it feels cool to me.
Should I have him throw another unit up to warm up the room or will it warm up becoming an interior room?
Thanks
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Run your costs per Btu for Ng and electric if thats what you have. Where I live electric is 50% higher than Ng and going higher. Consider also better insulation.
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mrbeanfan wrote:

My guess is you may have enough right there to account for the difference.
Will the new room be heated with the same boiler unit and will it have an extension from the existing pipe or will it have it's own home run pipes?

He may be right. The location on an outside wall would make it slightly less efficient, but it would also tend to make it more comfortable so that would be a trade-off IMO. However he is there and I am not. He also, I hope, has a lot more experience in hot water heating than I do.

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The new room is not practical to heat with hot water radiant--no way to get the pipes over there, and also the registers are not set up to easily add more zones. so it will be electric cove heat.
you are right I think, might well be enough to warm it up with the elimination of the old and leaky picture window unit. and it doesnt have to be 80 out there. we normally sit with sweatshirts and sweaters on in that room.
Joseph Meehan wrote:

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How do you figure your cost per BTU for natural gas and electric?
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Why not just put in a bigger radiator, Sure the addition will help but I dought it will solve the issue. I hope you know what insulation R values are optimal for your area and follow it, dont go by code minimuns.
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it is my experience that ANYTHING built over a slab, will be cold. (i'm in wisconsin) we finally surrendered and raised the floor and insulated underneath. the place is the same temp as the rest of the house now.
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