My preference would be to retain the Honeywell controller which would still handle system set-up and the background system control, and add a device...
The only comments I can add are that my experiences with the use of the Evohome controller as a room temperature sensor have been positive. You also...
I was thinking that the room temperature might drop during some of the 40min periods so that you notice it feeling cooler. If this happens you could...
I think the controller will work OK and the 40min periods won't cause it problems. It's a shame that the Evohome 6 setpoint daily limit isn't enough...
From your description of the problems it sounds like it's due to the messages sent from the controller not being received by the devices which would...