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New Construction W/ Radiant And Central A/C

 
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Old 11-14-2019, 09:14 AM   #1
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New Construction W/ Radiant And Central A/C


I'm planning my next new build. I know I want radiant heat in basement and garage floor, but also want central A/C. I don't want to use the mini splits or high velocity systems for A/C. What are my other options? Do I really need to install a boiler and furnace to get both??
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Old 11-15-2019, 08:44 AM   #2
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Re: New Construction W/ Radiant And Central A/C


You don't need a furnace, just an air handler for the AC. It might not cost less though.

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Old 11-16-2019, 06:27 AM   #3
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Re: New Construction W/ Radiant And Central A/C


The last one we did was a very small amount less. The customer decided to go ahead and install a furnace as well.

Radiant heat is great, but it also takes a while to warm up and cool down. If you wake up and it's chilly in the house, turning on the radiant heat, won't warm you up, right then. It will take quite a while. Whereas if you turn on the furnace, the house will be warm in about 20 minutes. (I'm guessing on time to warm up)

It's also good for those times when you have a cold spell. Might be 40 degrees for a few days, but warming back up after that. Those are times they use it.
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Old 11-16-2019, 07:17 PM   #4
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Re: New Construction W/ Radiant And Central A/C


I just did my house with radiant heat on every floor and central ac, I ran a 3/4 loop for a hot water coil in the Attic where the air handler is to have forced hot air for back up, I live in NYC and it gets pretty freaking cold.here so far it works wonders I haven't needed to put the forced hot air on yet

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Old 11-17-2019, 09:31 AM   #5
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Re: New Construction W/ Radiant And Central A/C


I would forgo the furnace portion & do as nickelec did (I assume he did an exchanger & not just looped coil). As for a boiler - it may not be necessary, you may actually be able to get by with a regular water heater but that requires some calculations which you need to do anyways so you not only get enough heat but don't overheat.

How are you doing ventilation air - stand alone ERV/HRV, tied into HVAC system, or other?
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Old 12-03-2019, 11:30 PM   #6
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Re: New Construction W/ Radiant And Central A/C


Update heat is on

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Old 12-04-2019, 01:03 AM   #7
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Re: New Construction W/ Radiant And Central A/C


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Originally Posted by nickelec View Post
I just did my house with radiant heat on every floor and central ac, I ran a 3/4 loop for a hot water coil in the Attic where the air handler is to have forced hot air for back up, I live in NYC and it gets pretty freaking cold.here so far it works wonders I haven't needed to put the forced hot air on yet

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I had radiant as my sole heat source in Fairbanks Alaska with -50 degree weeks. No issues keeping up, but it's all about the heat loss. I had a well insulated home.
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Old 12-04-2019, 07:57 AM   #8
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Re: New Construction W/ Radiant And Central A/C


Agreed so far I haven't needed the hot air back up , my house is completely spray foamed so heat loss is very minimal

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Old 02-17-2020, 09:25 AM   #9
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Re: New Construction W/ Radiant And Central A/C


We almost always use hydronic heating for the homes that we build. Have been installing HRV in all of the homes that we have build since 1991.
If you insulate well and have no thermal bridges the system works extremely well.
We use outdoor temp sensor so we know when outdoor temp drops the boiler can ramp up if required before the air thermostats measure lower indoor set temps.

Also we use floor sensors in the bathrooms. Nothing worse that warm summer air temps and having cold floors in bathrooms.


AC is ducted through the attic and on the main floor area as well.
Use good glass that rejects heat in the summer, roof overhangs that provide shading will help the solar heat gain issues.

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Last edited by Mike Canada; 02-17-2020 at 09:29 AM.
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