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Re: Heat question

To: Shop-Talk Mailing List <>
Subject: Re: Heat question
From: Jim Franklin <>
Date: Tue, 06 Dec 2005 19:29:06 -0500
On Dec 6, 2005, at 6:26 PM, Karl Vacek wrote:

> Similarly off-topic.  I've long wondered why residential HVAC systems 
> don't
> have more sophisticated controls like commercial systems - thermostats 
> that
> check the outdoor temperature and compensate accordingly.

They can...

> With today's electronics, it should be simple and cheap to offer a
> thermostat with an outdoor sensor, programmable compensation for the 
> amount
> of bias to add with decreasing outdoor temperatures, electronically
> programmable setbacks, etc. etc.

Indoor and outdoor reset boiler controls. Monitor the amount of heat 
being taked from the system while also monitoring outdoor air temp. I 
believe there's an anemometer input too.  Decent products. Not so decent web page :-)

Boiler manufacturers like Viessman are making controls like this for 
their boilers, and I believe they've done it for a while.


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