When the Clinton Administration proposed a shift to 13 SEER
(Seasonal Energy Efficiency Ratio) technology for air conditioning units, some groups pointed out that the size of these units would be an impediment to some builders. Manufactured housing construction was one of the groups cited, as space is an important consideration.
The number in the SEER ratings system correspond to relative savings in energy consumption. A SEER 13 rated system saves 30 percent on energy costs relative to a SEER 10 system.
For this and a few other reasons, the Energy Policy Act of 2002 rolled back standards to SEER 12. Some asserted that low-income people would be forced to bear higher costs than they could afford. Some Senators from the Upper Midwest and the Rust Belt argued that their residents would rarely experience the cooling demands that would make the investments viable. They were supported by representatives from AC manufacturers and energy companies.
Some people weren’t happy with that result. That included a coalition of representatives from the utilities industries as well as private contractors. Notably, low-income advocates from the Consumer Federation of America supported higher energy efficient standards, even as proponents for lower standards asserted that such standards should not be supported because they would put a cost burden upon low-income people.
The 2002 bill had language that would have put the SEER 12 standard into effect beginning in 2006. By that time, though, the EPA had ruled that new homes had to have SEER 13. Many states have SEER 13 requirements, too.
In spite of fears about size, producers have responded to the challenge. Now there are a set of specialty heat pumps and air conditioners with SEER 13 ratings that fit for manufactured housing applications.
I am going to list a few here. There is the Style Crest, the Carrier Air Master Heat Pump. There are surely others. If anyone has had success with a particular model, please share the information in a comment below.
Guidelines
The Manufactured Housing Research Alliance has a nice document outlining ways that consumers can save money on their heating and cooling costs. A more thorough publication from the EPA is here. These documents seek to give people the right product to fit their needs, without overstating the cost savings that might be possible. In some cases, consumers may buy too much cooling capacity.