I'm working on a climatemaster H2O source heatpump. The compressor went out on it. After installing the new compressor I would like to install a filter on unit. where is the best place in your opinion to locate the filter? I have the most room in the area where the coil is located. It is a 2.5ton unit. I don't have model # with me now its at work. I started this job late in the day and the supply house didn't get back to me yet.