I'm also looking for this for a church, without going to the expense of Honeywell Evohome or similar.
But what we have done in the interim is a programmeable thermostat so you can set the ON OFF times for a week ahead. to repeat until changed (and you can also put the heating on if you arrive to find no one had set it). There is a wifi version as well so you can move the position of the controller without needing to rewire.
Also, if your building is slow to heat up, you can set it for progressive warming, i.e. 16°C at 6:00am. 18°C at 8:00am and 20°C at 10:00am rather than a full on off system. This means that the heating does not come on much earlier than needed on a warm night.
I'm also looking for this for a church, without going to the expense of Honeywell Evohome or similar.
But what we have done in the interim is a programmeable thermostat so you can set the ON OFF times for a week ahead. to repeat until changed (and you can also put the heating on if you arrive to find no one had set it). There is a wifi version as well so you can move the position of the controller without needing to rewire.
Also, if your building is slow to heat up, you can set it for progressive warming, i.e. 16°C at 6:00am. 18°C at 8:00am and 20°C at 10:00am rather than a full on off system. This means that the heating does not come on much earlier than needed on a warm night.