Powerful thermoelectric peltiers

Hi,
I have read about technical specification of a thermoelectric peltier TEC1-12726 . The U max =15v , I max =26.3 and Qc max =257.27w. I would like to know about the cooling power in wat(cooling generating). It seems that the power consumption is about 400w. I have heard that  thermoelectric peltiers have good and high efficiency. I need some more information about any other powerfull peltiers with high efficiency to build an air condition unit. I need to make sure the power is the cooling power and/or power consumption.
I would be so grateful to have  some good suggestions and ideas as well.

Regards
Kevin

There is nothing efficient about Peltier. They don't get very cold and use way more energy to get cold then a conventional refrigeration system. To cool an entire house you would need to cover the largest wall in each room with them and have a good means of quickly removing the heat from the back side of the peltier so it doesn't affect the room temp. Even then you may not get a noticeable temperature change.

To put things into perspective. Your typical Peltier cooler is about 1.5" x 1.5" and uses about 50W @ 12VDC. So if you had to cover a small 8' x 10' wall thats about 11520 square inches. Divide that by the 2.25 square inch peltier and you would need 5120 peltiers. Each drawing 50W means you need a 256000W DC power supply. If you figure each peltier runs about $5 your spending $25600 to cool a single room. Not to mention the electric bill. Thats assuming a wall full of those things is enough to cool a room.
Mind you, 1/4 megawatt room cooler may be a TAD oversized.....
Peltier cells are VERY INEFFICIENT, compared to conventional refrigeration.