I had Good Guys install mine about a month ago. Current price is $150 (they misquoted it to me as $120 originally and when tech showed up he agreed to the original quote). As for doing it yourself, be careful. My home had a proprietary Carrier thermostat which uses two wires that feed into an electronic module. This module, depending on when your home was built, can be installed behind the wall, in the attic, or inside the HVAC unit. This module then connects to the non-proprietary wiring that is common in most all HVAC units. Since I didn't know where the module was located and didn't have a wiring diagram for the module I thought it worth it to have a professional do it. YMMV.
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