Key Features 5026 BTU, Medium Temperature, Scroll Comp Condensing Unit, 115V/60Hz/1Ph MODEL # STI050MR404A1 For Indoor Unit These refrigeration systems are designed to and certified for use in walk-in cooler applications. M 7: Highly Efficient Air Circulation Enclosure Is designed to release hot air to the outside faster than competitors’ and to enhance the cooling efficiency. At the same time, it retards elevation of compressor temperature and keeps refrigerant pressure from increasing, thus saving energy as a result. Asking $4,500 but willing to negotiate.