The SC Series is our easiest-to-install, self-contained cooling unit. It does not require an HVAC-R technician to install. The SC PRO Series embodies the latest and greatest system design technologies in an all-new housing design. Developed upon feedback directly from customers and installers, the unit incorporates a variety of high-end components at an affordable price point. By combining powerful airflow with quiet operation technology, the SC PRO is unrivaled when it comes to efficiently cooling small to mid-sized wine cellars. What separates the original SC Series from the SC PRO Series? The SC PRO comes complete with a new blower fan system that optimizes performance while operating at a significantly lower noise level. It also reintroduces a condensate management system, which effectively evaporates up to 3oz. of water an hour. This management system renders the drain line as an additional safeguard rather than a definite need. The SC PRO Series is a direct replacement for one of the most well-known cellar cooling units, the XLT. Designed for simple, through-the-wall installation, the unit fits between standard wall studs and a single piece mounting bracket eliminates the need for a support shelf. The SC PRO has a 30F temperature differential. In order to keep your cellar at 55F, the condenser intake temperature should not exceed 85F. This makes interior installation ideal for SC Series units. Note: Self-contained units require adequate ventilation on the exhaust side of the unit to dissipate the heat generated during operation. The condenser intake temperature should not exceed 85F.