Heat pump efficiency

The fan bearing is making noise on my 20 year-old bathroom kickspace heater. The fan motor is made by Gleason Avery ( model CSA 35250) and their catalogue no longer shows this model. I've contacted them via email without response and I'll call this week to try and get through. I'd like to avoid replacing the entire unit that otherwise works fine. Any other suggestions for sorting out a replacement fan. [ATTACH]46539[/ATTACH]

Hello, My name is Kevin, I have a new house in central florida, with r38 insulation in the roof, and r13 (I do believe, maybe r15 in the walls) reflective tin roof and cement board aka hardy-board siding with dual payne, vinyl frame windows. I have a 2 ton heat pump, carrier brand.. the air handler model number is fx4dnfo25. my home is around 1200 square feet I have disabled the electric heat. When I moved in the house it was june, the beginning of the hottest part of the year. im custom to living in much larger house, requiring the unit to run much longer to cool it down, giving you the nice dry feeling with long run times. In this house, it was constantly click click click... click with the thermostat, 10 minute cycles. only off for around 10 minutes. The a/c guy replaced the thermostat and says it is working correctly. its good to have many cycles to maintain. but I know starting and stopping is bad for the unit.. and my wallet. when we are at the tail end of summer, its worse because it doesn't have to run very long to satisy the thermostat. I don't think the house is as dry as it could be with a longer run cycle. I can fix it by putting the air on 72 or something in the summer, but the problem comes back as soon as it gets to 72... it only runs 10-12 ..MAYBE 15 minutes to maintain.. thus the humidity comes back. I know they are more efficient when they run longer. The fan speed was on medium. it was 1,2,3,4,5... 4 is for electric heat. it was on 2 ( medium) I placed it on 1, and it got a little better. On the stat, The cph was on 5, I put it on 2...are the above two actions ok? I have a what some call a shotgun house..aka long and narrow house. with a long hallway from front to back. the return is is the back half of the hallway, and the thermostat right above it. there are 6 doors that air pours out of in the hallway right to the air return, this being said, I feel the air or heat doesn't run long enough to push all of the air from the front of the house to the back, would moving the stat farther up the hallway closer to front help? For example, when I run the heat lately, I have the heat set to 74... I notice when I get up and set the heat to 76 before my shower, the heat comes on, and shortly after, it says its 71 or 72 in the house a few minutes after heat has been running.. I wonder if its finally pushing the cold air from the front of the house down the hallway. By the way I disabled electric heat to save $$$, and to try and lengthen run times. I suppose my questions are.. 1. Are my assumptions in regards to the stat location? 2.) Shouldn't my run times be longer? 3.) What can I do?..4.) always kinda thought I needed a ton & 1/2 unit..?. Sorry that was so long winded, just trying to give you all the info I can. Thanks in advance. Kevin