We are having a difficult time regulating our radiant heat system. There are 3 thermostats in our house. One in the bedroom that also heat the bathroom, and the whole left side of the house. Unfortunately, we like sleeping in a cool room, however, if we turn down the heat at nighttime, the bathroom is cold in the morning. What we have tried to do is to turn the heat way down during the day which takes about the usual 5 to 6 hours to cool the room down, and then we turn the heat back up before we go to bed so that by morning at least the bathroom is warm enough for our showers.
The other thermostat is located down the hall, which heats the living room, dining room, kitchen and hallway. That's comfortable enough if we leave it at 70/72. However, as spring approaches where the nights are cold and the days are sunny and warmer, the heat makes it almost unbearable so we need to open windows which cools off the area, but as evening approaches and the sun goes down, the area is so cool we need to turn the gas fireplace on to heat up the living area.
We also have a four season porch where the other thermostat is located. Right now, it is set at 65, but with the sun shining through all the windows, the thermostat reads 81 degrees. Tonight however, when the sun goes down, it will drop to 75. But, the floors are ice cold all day.
I must say that I am not entirely thrilled with radiant heat. I have always been use to being to turn the thermostat up to a comfortable temperature and within minutes feel the affect.
Is there a solution to our problem. We are heating an 1 level home of approximately 1800 sq. ft.

I would like to start out by saying I wished I had read your web site before I had my radiant system installed. Your site is very informative and useful. I live in central NJ, have a 3500 sq foot house, which is very well insulated and newly built in June of 2007. The boiler is a Weil McLean, there are 11 zones for heat in the house. The radiant system is under the plywood sub floor with insulation under the tubing, foil on the tubing side with approx a 3-4 inch air pocket. I keep the house set between 66-68' ,and I go threw approx 11-14 gallons of propane a day during the winter. I believe the equals 1 million to 1,4 mill BTU per day. The installer said he talked to the rep and that is typical usage, I think they are crazy,.. Is that typical volume usage of propane? I would appreciate very much unbiased persons opinion. Thanks for your time and website, Craig

Hello Fred,  It is great to find your site and information. My wife and I purchased a radiant system from The Radiant Company online. They told us they could design a great system for our house. I told them that our house is a listed historic home built in 1869 and I was concerned if we could actually have radiant here that would work.
They claimed they could and have sold kits to many homeowners that had houses even older than mine. After sending drawings we did of the basement area, and explaining we didn't have enough money to do the second floor (one of three floors) they sent us proposals on what it would cost. I had asked on many occasions about the situation of not having heat on the other floors. They never said anything about it.
Long story short, we did everything exactly as they said. And we then froze all winter. I am a disabled Vietnam vet with PTSD, so this did not help me as I had to stay home and suffer with the bone chilling cold. I turned the heater (Takagi TM1) up as far as I could, and we barely maintained 62 degrees and that was only when the outside temp was within 12-15 degrees. The propane truck had to make a delivery each week to our 100 gallon tank. I called them over and over again, and they refused help. They told me we had a 'massive heat loss". They then asked if we had curtains up on the windows. We said no. They said that was our problem. Broke, depressed and stretching our credit, we bought drapes and put up that 3M plastic on the windows. It helped somewhat, but during the night, as the temp outside went down, we were looking at 55 degrees in the morning in the house. I called them and they just basically kept chanting the massive heat loss thing. I said that they never told me about curtains, never asked about it either, nor did they say anything about delaying the heating of the second floor for a year.
Now, my wife and I are once again stressing out about how to do this. We have to remove dry wall ceilings with plaster lath under them to get access to the joists. We are so shell-shocked from our previous 'so-easy-an-old-lady-can-do-it' experience from The Radiant Company, that it has effected our marriage. They will do nothing to help. I'd like to take them to court, but cannot afford to, and besides, I'm sure we'd lose because we are just people and they are a company.
Victor and Susan