I went under my house today to check for duct leaks and I found a leak on one of the three or four main ducts that attach to the duct box underneath my furnace / AC. Seems to be leaking at the point where the duct attaches to the air box. What's the best way to fix it?

I recently moved into a new condo with baseboard boiler heating and wanted to change out the old Honeywell thermostat with a cheap programmable one (Emerson 1F78-151 5-2). After installing the Emerson the heat turns on when I set the thermostat below the apartment temperature and the heat turns off when I set the thermostat above the apartment temperature. There were only two wires connected to the old Honeywell. A black wire connected to R and a red wire connected to Y. When I looked at the instructions for the Emerson it said when installing a two wire system connect to RH and W so I connected the black wire to RH and the red wire to W. Once I noticed it was working reversed I tried swapping the red and black wires but it still seems to be working backwards. Does this thermostat not work with this system? Any help would be appreciated. [i]Old Honeywell Thermostat[/i] [i]Honeywell Thermostat Wiring[/i] [i]New Emerson Thermostat (RH is the connection to the right of W)[/i]