Supplemental home heating for the cost of running a light bulb
Solar energy conducted through attic roofs heats the attic air.
The Attic Heat harvester System shortens the time period that fossil fuelled home heating system are required reducing annual heating cost.
Attic heat harvesting system tests have been carried out each year in homes since 2011, one near Edinburgh, Scotland, and one near Toledo, Ohio, USA. Tests showed that to achieve room temperatures between 18 and 23°C (64 to 73°F), system peak periods for using solar heated attic air generally occur whenever average outdoor temperatures are between 10 and 15°C (50 and 60°F). The test homes benefit from some passive solar heating, in homes that have little or no passive solar heating the temperature range will be increased.
The time of year when average outdoor temperature is between 10 and 15°C is variable but most often determined by your home's latitude.
The following world chart gives an indication of when and where peak solar heating periods using attic heat harvesting are most likely.
Heat harvesting World-wide peak periods for solar heating
In general, the attic heat harvester system peak periods for using solar heated attic air are:
|World Latitude||30 to 40||40 to 50||50 to 60|
|AHH Peak Period||Winter||Spring and Autumn||Summer|
Attic Heat Harvesting in the UK
The following charts show Edinburgh UK and Brighton UK average climates, the shaded areas show peak periods for solar heating.
When home temperatures are high the automatic attic heat harvesting system does not operate.
Click on the city to see the a detailed climate chart
At northern UK latitudes the peak period for using solar heated attic air is from May to September, at southern UK latitudes it is during spring and autumn.
Average monthly climate information for charts on this website were obtained from www.metoffice.gov.uk/climate/uk/averages, www.climatetemps.com and from www.holiday-weather.com.
Our Attic Heat Harvesting System is the most efficient way to use solar heated attic air, it is inexpensive, very reliable, simple to maintain, and the pay back period is measured in months rather than years.