Home Depot Indoor Air Conditioner – Evidence.

A newer type of ductwork installation design has been tested and found to be a considerable improvement over any other ductwork installation design for use in humid and hot climates. Making use of specific calculations, these designs make use of running ductwork in the interior of the home under the ceiling plane at a much lower cost and produce zero-energy homes.. There can be no duct leakage to the outside, and conducive gains/losses are eliminated because there is no heat buildup in an attic for the ductwork to have to deal with, so the set point temperatures remain nearly constant in the ducts. These designs also make use of transoms in each room to promote good airflow to returns.

Home Depot Central Air – Extraction of Moist Air.

These can be efficient only if the furnace is centrally located. These radial designs for ductwork are the easiest to install and the most economical because there is less ductwork to lose air velocity and efficiency. Additionally, there is semi-rigid flex piping that can be run individually to each room, and there are claims that it diffuses noise pollution in the home. Further, these semi-rigid pipes have been tested and proven to deliver better air quality over time, extracting damp air in humid climates and not allowing dust to settle and trap mold.

Return air is received back through another trunk line with identical branches from the rooms to the HVAC to be re-conditioned. Instead of rigid round pipe for the branches from the extended plenums, some ductwork installation designs make use of flexible pipe. The ductwork installations for radial piping designs have no extended plenum but have round pipes attached directly to the furnace plenum and individual separate runs to the register boots and outlets. 

The standard installations for central systems with extended plenum designs are for three different furnace types: upflow furnaces in closets or basements, downflow furnaces in mobile homes or tight crawlspaces and horizontal furnaces that can be used in attics and some crawlspaces. From off of the furnace plenum’s extension at right angles, there are branches of round pipe that flow out each side to supply registers in the individual rooms.