February 2024

Greetings,

This month we offer you a few personal stories from neighbors on the front lines of the energy transition.

We are sharing some thoughts from homeowners about how heat pumps performed during the recent unusually long spell of extremely cold weather. Critics of heat pumps, used to both heat and cool homes using electricity, claim they don't work well in cold climates, but that's not what our homeowners found.

We are also sharing New Energy Colorado board member Barry Rosenberg's recollections of a road trip in his all-electric car. Range anxiety is preventing many people from going all-electric, and Barry shows how he and his wife maneuvered.

These stories in their entirety are on the recently expanded website we encourage you to explore at NewEnergyColorado.com.

Sunny regards,

Rebecca Cantwell 

for New Energy Colorado



Please forward this newsletter to friends and colleagues and let us know what else you would like to read about by emailing us here

Do Heat Pumps Deliver in a Colorado Deep Freeze?

By Angela Kantola

As a volunteer with the Metro Denver Green Homes Tour, I often interview prospective homeowners. After the nearly week-long "deep freeze" of sub-zero temperatures in metro Denver in mid-January, I asked five of our homeowners from the 2023 tour how their heat pumps had performed. Four were completely satisfied. One (new to Denver and in their first winter here) learned they needed to use their wood stove backup in an upper level great room for extremely cold weather.


Here's what the homeowners said:


"Comfy!!! During the recent several days of zero or below temperatures, our heat pump system kept our home warm and comfortable. We have a ducted unit and one mini-split head. An auxiliary resistance strip in the ducted unit kicked in more than usual (and "usual" is really very infrequent).


"My heat pump did fine. I tend to keep my house on the cool side (about 67), and I did notice for a bit the thermostat was reading ambient temp at 65. (I didn't turn on the ceiling cassette at all, so that was the whole-house unit only.) used a space heater in the living room one evening for a little extra warmth, but was otherwise fine. Once I upgrade insulation, I'm sure that will help. (Right now the heat pump is working with original 1960 insulation and doors.)"


"My heat pump performed well. Upon waking, the house temperature was 3-8 degrees below the set point of 68 in both zones (ducted cold climate heat pump that serves two zones). I was prepared for this as these temperatures are the rare 1% of coldest nights. I could either get a strip heater for my heat pump for these situations or use a supplemental heating source. This year, I used my gas fireplace as a backup during the day and a space heater in one room on occasion."


"I still have my [19-year-old] dual system with the heat pump working until it dips below 30 degrees and then the gas furnace portion kicks in. However, I had extensive insulation and air sealing work performed this fall and it made a significant difference during this Arctic Blast."


"During the cold snap the heat pumps could not deliver 69 degrees in the big room we have. It got to 61 degrees at best and we needed to bundle up or get the wood stove going. It was not comfortable. If it is only one or two days a year it is survivable but if we were to start again we would certainly want the design to include a back up for these days. The heat pump cassettes in smaller-volume downstairs rooms performed well."


READ MORE


Remember the Inflation Reduction Act can help you pay for home improvements to save energy!


Here are some links to helpful information:



Key To Successful EV Road Trips: Preparation

By Barry Rosenberg



Two years ago, my wife Lee and I took a road trip in our 2021 Tesla Model Y EV to Charlottesville, Virginia from our home in Denver. We made side trips to see friends, family, and national parks along the way and I estimate we travelled about 4,000 miles on this trip.


I realize many people who are considering buying an EV fear that if they travelled long distances, they might run out of battery going from one place to another. However, while I am anxious about most everything in my life, I did not suffer from range anxiety on this trip. Perhaps Lee and I were a little cavalier, but we had taken many long trips around Colorado and a longer trip to the Grand Canyon before heading to Charlottesville. The trips were relatively seamless because we had access to our GPS and knew where chargers were along the way.


Our Tesla has a range of approximately 300 miles, which allows for drivers to go significant distances between stopping to top up the battery. It is necessary to note that a “mile” on an EV is a calculation rather than a standardized measurement of distance. For example, if you are traveling at 80 miles an hour, have several passengers and/or pets in the vehicle, are going uphill, are exposed to headwinds, have low tire pressure and/or need heat or AC, you will suck up much of your battery unless you mitigate some of these factors as much as possible.


About twice a week, we drive up to a mountain trail from Denver. The actual distance from the city to the trail is roughly 40 miles. The trail is at an elevation of 7700 feet, whereas our home in Denver is at 5280 feet. Even though the actual distance is 40 miles, the “EV milage” is around 60 miles. To assure I don’t suck up the battery, I set an alarm before I make the trip to remind myself to charge the car. I usually have 200 miles of battery so if I use up 60 miles on the trip up, I should have 140 miles on my battery when I drive downhill.


Just as EV miles can be negatively impacted by environmental factors, so too can they be positively impacted. By going downhill from the trail to Denver, I get a “boost” to my battery of approximately 20 miles—so instead of 140 EV miles, I’ll have 160 to get me from the mountains back home.


The Boy Scouts motto of “be prepared” is apropos when driving an EV, but modern technology allows the car to do much of this preparation for you. On the trip back from Virginia, the car’s computer routed us to a charger maybe 100 miles away from where we were on the highway. However, the weather changed suddenly, and a formidable headwind started to drain our battery. The car used its GPS to reroute us to a different charger, and we ultimately had enough battery from this charge to skip the previously-suggested stop.       


READ MORE


Information on tax incentives for electric vehicles:

Navigate through federal, state tax incentives of buying an electric vehicle (denverpost.com)

Electric Vehicle Tax Credits | Colorado Energy Office

DE-CO - Drive Electric Colorado


Monthly Green Home Tour


Westminster near W. 100th Ave. and Wadsworth Parkway



Sat. Feb 17, 2024 --- 2:00-4:00


Sign up here for free tour of this all-electric solar home which features:


  • Passive and active solar heating with mini-splits
  • Interior thermal mass to reduce temperature swings
  • Quadruple pane windows U0.10 to U0.16
  • 14KW PV with battery backup
  • Produces more annual energy than used by EV car and house
  • Off-grid every evening
  • Near German Passive House standards and optimum HERS rating of 3 before upgrades



Sponsored by New Energy Colorado and Go Electric Colorado


FOR MORE INFORMATION: julia@goelectriccolorado.org 

Upcoming Events


­COLORADO ENVIRONMENTAL FILM FESTIVAL

February 22-25, 2024, GREEN CENTER, COLORADO SCHOOL OF MINES, Golden



The Colorado Environmental Film Festival (CEFF) is an exciting, inspiring, and energizing event that includes world-class environmental films with representatives from local and national organizations. CEFF screens feature-length and short films by foreign, local, and young filmmakers. True to the spirit of Colorado, this event is supported and attended by people who value the natural world and share a passion for the power and beauty of film.

More information here


CRES Denver

February 15 7 p.m.

PASSIVE HOUSE AND BUILDING PERFORMANCE IN THE AGE OF ELECTRIC VEHICLES

More information: https://www.meetup.com/metro-denver-cres/events/298334459/


CRES JEFFCO

FEBRUARY 20 7 p.m.

GREEN GARDENING IN DRY COLORADO

More information: https://www.meetup.com/j-cres/events/298961954/


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Nuclear goes backwards again as wind and solar set records

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