Upon arrival client mentioned his concerns with recent installation. Checked UNICO system in basement, set thermostat to cooling and monitored operation. Noticed that return ductwork is being sucked in and expanding on shutdown due to static pressure differential. Checked filter noticed filter restricted. Uncommon filter size did not have on truck. Hand-crafted 10x20x1 Filter and Installed. Ran system ok, System is now quiet and not making any expansion noise from ducts. Checked return grille upstairs noticed that client has a bookshelf blocking return grille. Explained to client that this was also causing a restriction in the system due to inaccurate temperatures. Moved furniture for client as a courtesy. Recommended for client to purchase 10x20x1 filter and have us install each year for maintenance. While on-site collected check payment from client. Spoke to client about Heating service, client currently has oil fired boiler. AC System is currently operational and cooling well at thi