[Cob] High thermal mass and low occupancy

[Lance Collins]

 From time to time I see comments that high thermal mass is a problem with 
buildings not continuously occupied due to the long warm up time when the 
residents return.

There is a heating product available here in Australia which uses solar 
heat and a very simple control system which may be of interest.  See 
www.sunlizard.com.au

The basic idea is to have a solar air heater and to pump the heated air 
into the house.  The clever part is the use of a small solar panel to drive 
the fan.   When the sun shines the warm air is pumped into the house.  No 
sunshine, no pumping.   It's difficult to think of a simpler control system.

In the right climate this would be a good way to warm your house when you 
are away.   (And of course when you are there normally).