Danny D'Amico wrote:
On Tue, 10 Dec 2013 09:16:34 -0800, wrote:

The photos appear to show a heating only thermostat, a very basic
one.

My fault...

I should have mentioned that the thermostat also controls the A/C.
Here is a picture showing the "COOL" setting:
http://farm8.staticflickr.com/7343/1...33aae09d_o.gif

Hi,
Don't blame 'stat. Have a look at furnace to see if it ignites when
signal is sent from the 'stat. Don't touch that anticipater it is preset
for the furnace. Has nothing to do with problem. Most likely your
problem is in the furnace. What kinda preventative maintenance did you
do during off season?