hello
I would agree that the addition of a fan would be your best option- because there will be times when you want the system and it has been programmed to be off. Plus all the equipment is in a seperate room.. so no need to worry about the fan noise
BUT, if you still want to work with a timer solution- smarthomeusa.com has some options:
this kit comes with the timer/controller, as well as 3 appliance modules (to switch off each part of your system) for only $63. also support two on/off times per day, as per your example
http://www.smarthomeusa.com/ShopByMa.../Item/HLTKITA/
you can check their site for others, im sure there are many.. just search for timers. I always buy from smarthomeusa.com - nothin but goodness so far