On Wed, 4 Jan 2012 11:24:25 -0800 (PST), "
wrote:

On Jan 4, 1:49Â*pm, bob haller wrote:
I wonder how often the solar heater will provide needed heat to the
home.

if may not be cost effective

Another factor is a forced air system frequently already
has a heat exchanger in it, the AC evaporator. Adding
another obstacle for the air to go through will create
more resistance for the blower. It might create enough
so that it burns it out the blower motor. Or the added
resistance reduces the cooling performance in summer,
etc. Overall, doesn't sound like a great idea to me.
More resistance won't burn out the blower motor unless it totally
restricts the air-low to the point the motor heat is not removed..

Rducing airflow just makes the blower turn EASIER, not harder.
Try blocking a vacuum hose and listen to the blower SPEED UP.