heat-loss / Green Building & Sustainable Home Renovation Information & Advice

The difference between air barriers and vapor barriers The job of a vapor barrier is to prevent vapor diffusion, and the job of an air barrier is to stop air leakage through differences in air pressure. A wall system should have one vapor barrier, but can have many air barriers. A vapor barrier can act as a very effect...

  Insulating a basement is a great idea if it wasn't insulated when built, as before we began insulating foundation walls and below slabs (see slab on grade), it was generally estimated that basement heat loss accounted for about 1/3 of the total heat loss of a house. It is likely that such an abysmal starting place ma...

The importance of installing doors and windows correctly: Window and door openings are breaches in a building envelope that need to be carefully managed in order to prevent moisture damage and air leakage in homes as well as to save energy. Water leaks from around windows and doors are the visible result of a poor inst...

Top Tips for preparing a home for winter Extremely low temperatures over winter can test your home in many ways, and sometimes your house will return a failing grade. Even brand new homes built to code can see failures of their building envelopes, windows, doors and ventilation systems during winter, a simple failure t...

It is easy to look at the R value rating of a material and assume that our entire wall assembly matches it uniformly. But when you factor in the thermal bridges caused by framing materials and any discontinuities in the wall structure, you can also quickly deduce that this is not the case. It doesn't take expensive equ...

Insulation slows the rate of heat transfer, helping keep homes warmer in winter and cooler in summer. How well-insulated your home is will determine how comfortable it is and how much you will spend on energy for heating and cooling, and in some respects, how durable it will be. The transfer of heat (or heat loss) occu...

Heat Pumps explained simply When it comes to residential heating and cooling systems, few types of heating systems are as energy efficient as heat pumps. But what exactly are heat pumps and how do they work? In short, a heat pump is simply an electrically powered device that is capable of transferring heat from one pla...

Geothermal vs. ASHPs - what's the difference? Heating and cooling systems play a crucial role in maintaining comfortable indoor temperatures in homes everywhere . With advancements in technology, homeowners have various options for energy-efficient heating and cooling systems. Two popular choices are geothermal heating...

How well does a mini split heat pump work in a LEED or Passive House certified home?  Really well as it happens, see a great example of a split system heat pump installation in the Edelweiss LEED Platinum V4 Home below: The Edelweiss House has a radiant floor to keep our feet comfortable but we rely on a Mitsubishi Mr....

Having a backup heat source that can operate without electricity should be an important consideration for many homeowners in colder climate zones, especially those who rely on a heat pump or electricity as their primary source of heat. In this guide, we will explore the various factors that can influence the need for a...

There are many manufacturers of heat pump water heaters on the market, which, rather than heating water with an electric coil as a normal electric hot water tank does, employ an evaporator to extract heat from the air (either interior or exterior) and use it to make hot water. The byproduct of an air-to-water heat pump...