Need help with wireless sensors/thermostat

[mymaus1]

I am not a professional. I am looking for guidance so I know what to ask for when purchase form and hire a professional to install what I need. Here is what I am looking for (if it exsist):

I own a 2 family rental unit which is served by one forced air furnace -- a relatively new Lennox. I pay the gas bill. Right now, the thermostat is in one of the apartments and that tennant has a tendancy to crank up the temperature higher than it needs to be. The upstairs tennent then opens her windows!

I would like to have something installed that would allow me to put a sensor in each of the apartments. The sensors would both communicate back to a thermostat located near the furnace that I would put in a lock box. I would set the temperature to something reasonable and the thermostat would read the sensors and average their values to determine what the average temperture is and control the furnace accordingly.

Does something like this exist? Is it gonna cost an arm and a leg? Can the sensors be wireless? If so, does wireless cost a lot more than wired? What brand and model number would you recommend?

[codewriter]

It would be cheaper to have someone run sensor wires than going wireless since its only 2 stories.
Just about any t-stat can use remote sensors these days, all the installer has to do is know how to wire it properly, its not a big deal.
Just call any good company around you, they will know what to offer you.

[ctrlguy]

Then the tenant will have to put an ice bag on the sensor when he wants it warm.

[codewriter]

Then the tenant will have to put an ice bag on the sensor when he wants it warm.

ROFLMAO!

Ive seen my share of ones with burnt bottoms from lighters!

[mymaus1]

Then the tenant will have to put an ice bag on the sensor when he wants it warm.

Are you serious???? Are the sensors that obvious -- are the tenents really going to know what they are?

Also, what models work best without spending an arm and a leg?

[ctrlguy]

There are wallplate sensors -just a blank stainless steel plate- though I don't think they're as responsive to room temperature as a standard sensor. One of those combined with a dummy thermostat is your best bet. Simple averaging of two spaces can be tricky anyway. If one space is 80 and one is 60 and your setpoint is 70, you're at setpoint, so the spaces must be more or less equally balanced.

[DEC920]

Take a look at Spinwave Systems. www.spinwavesystems.com