If you're good with basic electronics, you should be able to wire up a delay relay to do exactly this.
Should be pretty cheap to buy a delay (off) timer from automation direct and just turn the dial to whatever minutes you want. Wiring and knowing which wires do which may be the hardest part.
I was looking into building one using an Arduino, but I also need one for my mother's house that has to be pretty. I know Nest can't be the only ones who thought of this.
What they have is expensive shit they make a healthy profit off of lol. Not a bad idea if you're a person that doesn't care about costs but it's not a common request. Shops make a good slice of their income on cleaning coils so they're not clamoring to solve that problem. It gets them in the door and means they'll have an opportunity to sell you a new unit.
If you can arduino you're way more savvy than I expected and you totally can build two delay timers either with an ice cube relay, or fancy pants arduino programming (but then you need to power it, hide the device somewhere, program it, etc) I myself would simply go with the AD.com standalone relay
If you're good with basic electronics, you should be able to wire up a delay relay to do exactly this. Should be pretty cheap to buy a delay (off) timer from automation direct and just turn the dial to whatever minutes you want. Wiring and knowing which wires do which may be the hardest part.
I was looking into building one using an Arduino, but I also need one for my mother's house that has to be pretty. I know Nest can't be the only ones who thought of this.
https://www.instructables.com/Arduino-Thermostat/
I might gut a cheap thermostat and connect the display and buttons to the Arduino.
Have you tried calling your local HVAC place and see what they recommend?
What they have is expensive shit they make a healthy profit off of lol. Not a bad idea if you're a person that doesn't care about costs but it's not a common request. Shops make a good slice of their income on cleaning coils so they're not clamoring to solve that problem. It gets them in the door and means they'll have an opportunity to sell you a new unit.
If you can arduino you're way more savvy than I expected and you totally can build two delay timers either with an ice cube relay, or fancy pants arduino programming (but then you need to power it, hide the device somewhere, program it, etc) I myself would simply go with the AD.com standalone relay