The round design of the Deltec Home is more energy efficient than a same-sized rectangular home for two reasons:
First, the same aerodynamic design that makes our homes perform well in high winds also allows fewer drafts. Compared to the long and straight exterior walls found in a typical home, there is simply not enough surface area on one side of a Deltec house to allow pressure to build up. Less pressure equates to fewer drafts to pull air in and out of cracks and seams, and according to the U.S. Department of Energy, 25-40% of a typical home's heating and cooling energy use is due to air leakage.
Second, a circular shape has less total surface area than a rectangle with the same floor area. Every square foot of surface area exposed to a colder temperature outside will give off heat into the environment, so the fewer total square feet in the exterior walls, the less energy is lost to the surroundings. Physics is on the side of a round Deltec home!
We love our Deltec. It is a wonderful design and is VERY fuel efficient. It was green before green was cool. - Becky A., Greenville, SC
Due to the superior energy efficient design of the Deltec home, all the south facing glass and the active solar power equipment, the home is totally self sufficient. - John J., Telluride, CO
Our Deltec home has exceeded our expectations. It is comfortable inside and looks great outside. We are very happy with the energy efficiency and comfort of this design. - Marianne K., Harrisonburg, VA
Each time the gas company sends out a bill, they include a chart comparing our consumption with their average customer. Always, our consumption is just half of the average. - Ed B., Holcomb, NY
Our past electric bills ranged from $120 to 250. With our 4000 sq. ft. Deltec (around 3 times the size of our old house), our electric bill averages around $120, $130 per month. - Kim M., Magnolia, TX
We love our Deltec home. It is very energy efficient (we have not had a gas bill over $75 this year), spacious, easy to maintain, and incredibly "livable." - Daniel & Lynn W., Wildwood, PA
We have just gone through our first winter and I can't believe how tight this house is, and how it weathers the local winds which are occasionally pretty interesting. - Joseph R., Oakhurst, CA
Using regular windows, floor plan design & sub-tunnels we have such great natural lighting that we almost never need to turn on any lights in the house. - Beth H., Charleston, SC
Even on coldest days in Colorado, our house stays in the low 60s without using the furnace during the day. In the summer it never gets above 75 even if 15 degrees warmer outside. Love my house! - Suzanne M., Buena Vista, CO
Everyone else around us is crying about $500-$600 a month electrical bills and ours was $239.00 last month which is really low for Hawaii. - Keith B., Holualoa, HI
For our new home, we built to the basic Deltec standards…and our Deltec Home earned a HERS score of 34. Our home uses 66% less energy than code-built new homes. We’re very pleased with the energy efficiency. -Barbara P., Richford, VT- - Barbara P., Richford, VT