Prices for a typical solar thermal installation range from $2,000 to $7,000.
Photo courtesy of the Solar Energy Industries Association
This home's 7-kilowatt PV system produces nearly all the electricity the home uses each year.
Photo 1: In this low-slope roof assembly, holes are provided in roof framing members in an attempt to provide cross-ventilation.
Photo courtesy of Professional Investigative Engineers, Arvada, Colo.
Photo 2: This is a close-up of condensation development on the bottom side of a roof deck in a vented low-slope roof assembly.
Photo 3: Condensation developed on the underside of roof sheathing in this low-slope roof assembly in a heating climate.
Photo 4: This is an example of a mechanically vented cathedral ceiling (similar to low-slope construction in cross-section). Airflow measured at the two vents adjacent to the fan matched the fan draw velocity. No airflow was measured at the exterior bay, which was just 64 inches from the fan, despite 2-inch diameter holes cut through the joists in line with the fan. No airflow was measured at eave vents.
Photo 5: How much airflow will occur between framing members with 1-inch air space in this assembly?
Photo 6: This is an example of prescriptively following IBC 2006's ventilation ratios. The opposite parapet wall also has the same vent spacing. We calculated that even this quantity was not enough to meet the 1/300 ratio.