Award Winning Samish Solar Home Case Study

Award Winning Samish Solar Home Case Study

Written by: Nicole Miller

The U.S. Department of Energy announced that the submission for the Samish Solar Home from Powerhouse Designs and TC Legend Homes has been selected as a 2023 Housing Innovation Awards Winner!

Department of Energy Zero Energy Ready Home Housing Innovation Awards 2023 Winner official poster. 
"Powerhouse Design & TC Legend Homes" 
"Samish Solar Home, Bellingham, WA. TCLegendHomes.com." 
Photographed is the home that has won the award. It is a south-facing home with clearstory design, painted a forest green on the exterior with sunroom and covered porch and separate entry between the main house and the garage. 
“This is by far the most e cient, nicest, and most comfortable house we have lived in!” Homeowner
"Project Data
Layout: 4 bdrm, 3.5 bath, 2 fl s, 2,345 ft
• Climate: IECC 4C, marine
• Completed: June 2023
• Category: Custom for Buyer
MODELED PERFORMANCE DATA
• HERS Index: without PV 33; with PV
-20
• Annual Energy Costs: without PV
$650; with PV $-300
• Annual Energy Cost Savings: (vs
typical new homes) without PV $1,500;
with PV $2,450
• Annual Energy Savings: without PV
11,550 kWh; with PV 23,100 kWh
• Savings in the First 30 Years: without
PV $62,400; with PV $101,800" 
"Key Features
Walls: SIPs, R-29 total: 6.5" graphite EPS SIP with OSB sides. House wrap, fi ber cement lap
siding. Aerosolized acrylic whole-house air sealing.
• Roof: SIP roof, 10.25" R-49 graphite EPS SIP roof, insulated splines. Synthetic
underlayment, metal roofi ng with cool roof index of 32.
• Attic: Unvented vaulted ceilings.
• Foundation: Slab-on-grade foundation; R-23 ICF stem walls; R-20 closed-cell spray foam
under slab.
• Windows: Triple-pane, U=0.16-0.18, SHGC=0.32-0.50, low-e3, argon-fi ll, vinyl-framed.
Shading: extended eaves, landscaping for shade, half of sunroom roof is opaque metal.
• Air Sealing: 0.27 ACH50, all SIP panel joints sealed with double bead of mastic and tape.
Windows and doors are foamed in. Whole house aerosolized acrylic sealant.
• Ventilation: HRV, continuous at 30 cfm, humidistat and CO sensored for boost. Also
mobile phone alert to IAQ sensors. HRV has HEPA fi lter.
• HVAC: Air-to-water heat pump, 3.92 COP for heating and 6.75 for cooling; 23.02 EER.
Radiant fl oor heat downstairs, fan coil upstairs. Designed for passive heating.
• Hot Water: Powered by the same air-to-water heat pump that heats and cools the home.
• Lighting and Appliances: LED lighting. ENERGY STAR appliances, induction cooktop.
• Solar: 10.8-kWh PV.
• Energy Management System: IAQ sensor controls for ventilation.
• Other: PV designed for house load + electric vehicle charging."

This national award represents a significant achievement, recognizing the most impressive and advanced homes among leading DOE Zero Energy Ready Home builders. Our standard-setting leadership serves as an example of what every homebuyer in the nation should come to expect and demand from their home.

US Department of Energy Zero Energy Ready Home Housing Innovation Awards Winner. "Powerhouse Designs & TC Legend Homes"
"Bellingham, WA
TCLegendHomes.com
Project: Samish Solar Home
Bellingham, WA"
"2,345 sqft, 4 bedroom, 3.5 bath, 2 floors. 4C Marine, Custom for Buyer." 
"HERS -20. This home's score with PV" - Indicates the HERS overachieves beyond the point of being just a Net Zero home which has a HERS of 0. The average new home as a HERS of 90 and the average existing home has a HERS of 140. 
"$-20 Average Monthly Energy Bill. Calculated." 
"$2,450 Annual Savings. Calculated versus typical new homes."
"$101,800 Saved in the first 30 years. Includes fuel escalation rate, 2021 EIA Energy Outlook."

The Housing Innovation Awards helps us celebrate our success in providing our customers with the best in energy efficiency, indoor air quality, comfort, and construction quality. Awardees this year are being recognized for innovative use of off-the-shelf technologies and strategies to achieve advanced performance; innovative use of leading-edge technologies and strategies to achieve advanced performance; market transformation through education efforts; and innovative implementation of decarbonization strategies.

"Powerhouse Designs & TC Legend Homes, Samish Solar Home, 2023"
A floor plan of the winning home.

Find Out More About the HIA Awards Here.

To start designing your very own potential future Housing Innovation Awards winning home, contact us today!

Featured in the Northern Lights: Point Whitehorn net-zero home constructed with efficient features

Featured in the Northern Lights: Point Whitehorn net-zero home constructed with efficient features

Written by: Senna Scott

Our Point Whitehorn net-zero home was featured in @TheNorthernLight Blaine & Birch Bay’s Community Newspaper!

“Nestled adjacent to wetlands and with views of Birch Bay State Park, TC Legend Homes’ Point Whitehorn house is not your average house. The home has a 7.2kW photovoltaic system – the conversion of light into electrical energy – and is built in a highly efficient envelope, setting it up to be a net-zero energy house in Birch Bay.”

You can learn about our cost-saving measures and design challenges by reading the full article online >> HERE <<

TC Legend has been recognized by U.S. EPA as a 2023 Indoor airPLUS Leader Award winner

TC Legend has been recognized by U.S. EPA as a 2023 Indoor airPLUS Leader Award winner

TC Legend Homes has been recognized by the U.S. Environmental Protection Agency as a 2023 Indoor airPLUS Leader Award winner for our ongoing commitment to building homes with improved indoor air quality through participation in the Indoor airPLUS program.


“Congratulations to all 14 2023 Indoor airPLUS Leader Award winners!” said David Rowson, Director of EPA’s Indoor Environments Division.

“It is always inspiring to have the opportunity to recognize the incredible work that our partners do every day, from expanding the use of Indoor airPLUS on a national scale, to maintaining strong leadership within their local communities. On behalf of EPA and the Indoor airPLUS team, we would like to congratulate and thank the 2023 Indoor airPLUS Leader Award winners for all of their work in constructing healthier homes for the American consumer”.


This annual award recognizes market-leading organizations who promote safer, healthier, and more comfortable indoor environments by participating in the Inoor airPLUS program.

To learn more about the 2023 Indoor airPLUS Awards and the Indoor airPLUS Program, visit www.epa.gov/indoorairplus

Net zero development: Which way to run the streets

Net zero development: Which way to run the streets

Written by: Jake Evans

Which way do you run the streets to maximize solar exposure for dense Net Zero development?

A street view of a row of colorful houses. The center blue house is a Net Zero house designed by Powerhouse Designs and built by TC Legend Homes.

Common wisdom states that the optimal streets run east west, which makes sense if you’re the house on the north side of the street, because there’s nothing shading your house, garden or solar panels. However, living on the south side of the street, you suffer from north facing gardens and probably some shading unless the lots are 5000sf or greater.

Critically, 10 dwelling units (du) per acre is the density with enough inhabitants to support a bus service (*1), a key part of the sustainable urbanist vision for transit, pedestrian & bike use, rather than private cars. An acre is 43500sf.

My conclusion is that the common wisdom is wrong for dense, Net Zero development, that the streets should run north-south.

A Net-Zero house has most of the windows on the south side of the house because south facing windows can be effectively shaded from summertime overheating, and can harvest wintertime solar energy.

Because all the windows are on the south walls, we can’t have another 2-story house immediately to the south as shown in ‘East-West 3700’ below, or the valuable direct wintertime sunlight will be prevented from entering & you’ll have a house that is gloomy all winter.

Sure, if the lots are big, we can keep the southern house away, as shown in ‘East-West 4500’ below, but then we end up with less than 10 du/ acre (du/a) and there’s no bus & everyone’s driving cars.

The ‘North-South 3800’ drawing below shows a 1-story neighbor garage to the south, avoiding shade. Bingo! That’s a 3800sf lot, and offers 11.34 du/a. Additionally the frontage length is reduced which lowers roadway & utility development costs.

Street Orientation Option 1 North-South 3800. A drawing showing a block of houses on streets oriented north to south and situated on their lots with garages on the north side and the long side of the house on the north and south side, allowing solar gain on the south side while not being blocked by the roofline of the neighboring house. Text says "2000 sf house with dbl garage. 3835 sf lot. 59' frontage / du = 11.34, du/a = density supports bus OK. Winter light = 100%. Equal solar exposure for all houses."
Street Orientation Option 2 East-West 3700. A drawing showing a block of houses on streets oriented east to west and situated on their lots with garages to one side of the house and the long side of the house on the north and south side. The two houses to the north of the block have garages on the west side and the southern two houses have garages on the east side mimicking the layout. The orientation allows solar gain on the south side but the diagram shows that 40% of the northern houses will be blocked by the roofline of the neighboring southern house. Text says "2000 sf house with dbl garage. 3700 sf lot. 74' frontage / du = 11.76, du/a = density supports bus OK. Winter light = 60% @ northern houses."
Street Orientation Option 3 East-West 4500. A drawing showing a block of houses on streets oriented east to west and situated on their lots with garages to one side of the house and the long side of the house on the north and south side. The two houses to the north of the block have garages on the west side and the southern two houses have garages on the east side mimicking the layout. The orientation allows solar gain on the south side while not being blocked by the roofline of the neighboring southern house. However the houses are visibly farther apart. Text says "2000 sf house with dbl garage. 4505 sf lot. 74' frontage / du = 9.66, du/a = density ~ supports bus OK. Winter light = 100%."

(*1) Transit modes related to residential density (Boris Pushkarev & Jeffry M Zupan)

Educated Design: A year in the Murphy House

Educated Design: A year in the Murphy House

Educated Design: A year in the Murphy House

Written by: Jake Evans

There’s a right & a wrong way to design windows on the southside of a house.

The Murphy windows are done the right way, are a bit high, tucked up towards the eaves to admit the low winter sunshine yet shade-out the unwanted high summer sun so it can’t enter the building & warm up the interior.

This means your windows are a bit high and look to the sky.

I battled Ted for years about these windows because I want houses to look at the ground, and, the sky. However after twelve months looking at the ever-changing sky of the Pacific Northwest I am a convert, and a disciple. It’s just fabulous walking into a cool house in hot high summer, knowing that absolutely no sunshine is entering.

In the summer I want to live in a cool, dark cave. In the howling winter I want to live in a bright, warm sanctuary.

The Murphy house brings this contradiction to life, and then adds space to time:

There is 750 square feet of space inside the Murphy house, and there is 600sf of deck-space outside. The two spaces flow easily into each other. How, why, what?

You walk out onto a very modern pale-colored interior-style floor. It feels clean, like a room that’s outside, rather than a deck. Indeed I used to vacuum that floor with the shop vac, and it came up trim with the clean-house feeling. Add good exterior furniture and a partial roof, lights and pots growing peppers in the sunshine & you have a place to go, even it’s just to water the peppers. Now I’m drifting in and out, and out and in. Stimulation outside, sanctuary inside. I move between the two feeding my appetites and resting.

As my life progressed from summer into winter I was left inside again, with those three sky-windows pointing up, but now I was looking at dark sky, stars, tungsten-lit clouds and tungsten-lit storms.  The Murphy house was flooded with ambient night-light. Planet earth travelling around the sun is tilted, and the Pacific Northwest was at its distance-extreme from the sun; dark & cold, & I knew it.

Here’s the secret: if you put the windows above chest height you don’t need shades for privacy because there’s nothing to see except a head. So now there can always be a view out, so you can see it all.

I’m not sure it’s reasonable to write a whole post about 3 windows and a deck, but that’s really where it’s at.

The kitchen is worthy of mention because it formed an epic super-social axis around which I could meet new people; I would cook, and all these new dudes would sit at the bar. I think the concept of ‘defensible space’ bluntly describes how the kitchen/ counter combo lent me ease and accommodated new minds.

The very dark bathroom was the deepest and most welcome part of the summer-cave, a heavy earth-tile retreat, darkly contrasting with the bright, bright apartment (delete repeated word).

I never lived in the Murphy house with anyone, and there remain questions in my mind about privacy & the closeness of the bedrooms to the common areas. To my mind Ted’s Leong house addresses most of these concerns.

The western light poured through the double doors in the summer; orange and yellow and picked up the yellow fir floors. It was a golden place.