Install part – float switch Upon arrival, homeowners asked me about a duct cover for their outdoor condensing unit. Unit is on first floor of a two-story patio with a screened in wall. I explained the risks/extra stress that this addition may put on their fan motor/compressor. Homeowners do not want to move forward with this addition today, just needed a price. Installed new primary flow switch. Noticed a small gap from air handler to supply Plenum. Sealed this gap with mastic tape.