This BLOG discusses issues and options for ventilating an airtight home. Airtight homes have less natural ventilation coming through gaps and cracks. With windows closed and no mechanical ventilation system in place, you may wind up with an unhealthy home. In fact, it could lead to a dangerous buildup of carbon dioxide, carbon monoxide, mould and mildew.
This BLOG discusses the causes and suggests steps to improve your house heat loss in winter and heat gain in summer. The causes come broadly from 3 areas, about one third each: (1) ceilings, (2) windows and (3) walls, floors and general air leaks. Your choices on what do depend firstly on whether you are building a new house, renovating an existing house or improving the thermal performance of an existing house.
The factors affecting HVAC design should be considered from the outset. Otherwise, it may lead to costly changes through the building process. Therefore, put some time and effort into thinking this through as the first step.
Reduce heat loss and running costs, and improve air quality with Heat Recovery Ventilation (HRV). This BLOG explores HRV and ERV ventilation systems. Homes built years ago were not designed for efficiency and so they leaked air everywhere. Modern homes with 6+ Star rating are much more air tight and require ventilation systems to keep a fresh feel inside without needing open windows in winter and summer. Air leaks and open windows can account for a quarter of your energy costs.
This Victorian house in Castlemaine was transformed into a comfortable, low energy home. It features all-electric heat pump hydronic heating/cooling, heat recovery ventilation and heat pump hot water. The new home married its Victorian past to a modern extension using passive home principles.
A cool temperate climate zone such as Victoria is well suited to hydronic heat pumps. This is an efficient and effective way of heating and cooling if your home is well insulated. It will give you low operating costs and can be largely powered by your solar panels. Cool Temperate zones have: low humidity,
high diurnal range (temperature swings), cold to very cold winters and hot dry summers.
