Thermal mass / Discussions

What is the latest on phase change building materials?

...thermal mass in homes for energy efficiency. We were hopeful that phase change drywall with wax beads would make more of an impact in the green home building community than it has just yet, so if you or anyone knows of any new PCM materials on the market please let us know in the comments section below! While clearing ...

Posted by Jon Tirpak July 9, 2025 Materials and resources 1 response

How do you insulate a basement slab to keep the benefits of thermal mass in a passive solar home?

...thermal mass heat regulation, but your slab will. Read more here - How thermal mass in a home can help regulate temperatures for comfort and efficiency Thermal mass that is separated from the heated space by a layer of insulation, such as ICF construction, it will offer virtually no heat regulating assistance. Concrete...

Posted by Trudy Lynn Oct. 25, 2024 Passive solar home design 1 response

What is the best way to do a radiant floor in an off grid house?

...mass in a wood-burning stove, a masonry heater, or even a non-electric pellet stove. But whatever you do, first minimize heat loss by building super efficient, and if possible incorporate passive solar heating. If you're considering electric radiant heat as part of your system, you might find it helpful to compare radi...

Posted by Julien Comtois Oct. 2, 2021 Heating and cooling 6 responses

If a passive house is designed well is it worth the extra cost for Low E window coatings?

...thermal mass and good overhangs would double or triple glaze Argon filled windows be appropriate without the Low E coating?  The Low E coating does reduce the solar gain even if you choose a coating designed for the northern climate.  (I am in Ontario 44 degrees north).  My application would have 5x5 ft fixed windows w...

Posted by Joe Van Kuren June 7, 2019 Passive solar home design 1 response

Does hydronic radiant cooling work?

...thermal mass inside the home, so if you invest in a very efficient wall assembly and airtight building envelope, you can often wait out a heat wave (at least on the main floor) without the need for artificial cooling, as the concrete absorbs the ambient heat from the home. That and even a small localized heat pump may ...

Posted by dean c April 30, 2019 Delivery: radiant, forced-air and decentralized 1 response

Are there any updates on the progress of the second demonstration house?

I am most curious about the effectiveness of the air tube floor heating system. The house is now standing, it is the first house built of our new prefab modular kit houses available across Canada and the US. you can see a full break down of the mechanical systems, energy performance and total carbon footprint on this p...

Posted by dean c April 30, 2019 Solar thermal collectors 2 responses

Can south facing windows and glass doors, double glazed, be used to collect passive solar heat?

...thermal mass in the path of the sun to absorb the heat so it can later be released as the temperatures drops. If your house is built and your windows are in place, there isn’t a ton you can do at this point except perhaps have thermal mass in the path of the sun to collect heat, but that could be quite a bit of work fo...

Posted by Sue Whall June 5, 2020 Passive solar home design 2 responses

What flooring options work with a passive solar design?

...thermal mass is for maintaining heat during winter months. What about placing a vinyl corked backed flooring over the concrete floor? We are looking to build a single-story house with a walk-out basement. Southern Ontario and we have full unobstructed southern sun exposure. Do you have any other tips to consider? Thank...

Posted by Christopher Dunn Feb. 23, 2020 Passive solar home design 1 response

Will I save energy by lowering my thermostat at night?

...thermal mass inside the building enclosure. Lowering thermostats at night made a lot of sense 40 + years ago when homes were poorly-insulated and sometimes not insulated at all. Back then a furnace would cycle on and off many times in a day (or even in an hour) to keep the house at the designated temperature. The savin...

Posted by Ryan Peterson May 1, 2018 Heating and cooling 4 responses