P.Eng, Energy management, measurement & verification. Toronto, Canada. Born 327ppm CO2. Climate Action & electrification; Safer infrastructure; cycling; air filtration & ventilationhttps://bsky.app/profile/davidelfstrom.bsky.socialhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mkzngg2dn22iThe fraud is coming from inside the house [contains quote post or other embedded content]04 May 2026 12:12 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mkzngg2dn22ihttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mkwcggpjjs2fCurrent reference conversion for Canadians: $5/gal USD = $1.80/L CAD usgas.ca https://usgas.ca/03 May 2026 04:17 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mkwcggpjjs2fhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mkuqu6sxnk2aOh so it's going to be one of those days02 May 2026 13:30 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mkuqu6sxnk2ahttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mkgl2ycdws2aThe Dundas West/Bloor Loblaws grocery store is becoming a liminal space. #Toronto It's closing May 2nd to become a No Frills.26 Apr 2026 22:09 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mkgl2ycdws2ahttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mkdyd34jmk2oOn average, it's fine. [contains quote post or other embedded content]25 Apr 2026 21:29 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mkdyd34jmk2ohttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mkbdzoszwc2nImagine if every time you went to use your car you had to: 1) install the front and rear lights and turn them on 2) unlock and stow your door handles 3) attach your removable navigation system 4) attach or wear your dashcam 5) manually turn on your dashcam 6) don your helmet & vest24 Apr 2026 20:20 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mkbdzoszwc2nhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mk7dlwwih22nInteresting developments in thermoacoustic heat pumps that don't use a refrigeration cycle. https://www.pv-magazine.com/2026/04/23/thermoacoustic-heat-pumps-on-the-verge-of-commercial-breakthrough/24 Apr 2026 01:07 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mk7dlwwih22nhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mk6cean2lc2zTIL walkie-talkied is a verb23 Apr 2026 15:12 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mk6cean2lc2zhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mjailxkwzk2yHow many years has the segment in the middle of the West Toronto Railpath been closed, and for what reason, really? It's made it close to useless. https://www.metrolinx.com/en/projects-and-programs/kitchener-line-go-expansion/what-were-building/corridor-work11 Apr 2026 18:44 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mjailxkwzk2yhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3laje3b6ylk24Happy #Caturday Our little guy loves this bathrobe belt. This photo is when he had just pulled the belt off the robe, causing the bathroom door to close him in. We've let him have the belt and he's very happy.09 Nov 2024 13:04 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3laje3b6ylk24https://bsky.app/profile/davidelfstrom.bsky.social/post/3mizeaftanc2k🇨🇦 Canadian artist Description: A stand of birch trees, background of a clear blue sky and lake with the sun at a low angle from behind the viewpoint, giving a warm glow to the upper part of the trunks with the lower portion in blue shadow. Colours pop as if viewed through a polarization filter [contains quote post or other embedded content]08 Apr 2026 22:37 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mizeaftanc2khttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mipljbav3224EXIF info for the NASA earth photos here! Nikon D5 ISO 51200 22mm (14-24mm f/2.8 lens) Light: 1/4s, f4 Dark: 1/15s, f5.6 [contains quote post or other embedded content]05 Apr 2026 01:21 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mipljbav3224https://bsky.app/profile/davidelfstrom.bsky.social/post/3miaijzwvdk2sI don't normally like cookies that aren't like a home baked style, but these... wow! The filling tastes exactly like mint chocolate chip ice cream.30 Mar 2026 01:18 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3miaijzwvdk2shttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mhsappe2pk2iQuicksand, the Bermuda triangle, and falling down the stairs were the most common causes of death in the 1980s [contains quote post or other embedded content]24 Mar 2026 09:20 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mhsappe2pk2ihttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mhp2xghfw22xThis example is a lot more entertaining than the story of how Dr. Barry Marshall had to infect himself with Helicobacter pylori in 1984 to prove that the bacteria caused stomach ulcers, not stress or spicy food. [contains quote post or other embedded content]23 Mar 2026 02:59 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mhp2xghfw22xhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mhp25nya7223While walking the dog tonight I heard a car honking the shave-and-a-haircut rhythm, twice, and for a brief moment I thought "what if he's dead, and this is how I found out"23 Mar 2026 02:45 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mhp25nya7223https://bsky.app/profile/davidelfstrom.bsky.social/post/3mhgzvyu5fk2cI'm not sold on this austerity. We need many of these to be increased, not decreased in the face of US immolation. [contains quote post or other embedded content]19 Mar 2026 22:19 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mhgzvyu5fk2chttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mhgbhbaz622qVancouver moving towards all-electric water heating for homes. Starting January 1, 2027, when a water heater needs replacing in existing one- to three-storey single family homes and duplexes, it must be replaced with a model that is at least 100% efficient. #ElectrifyEverything https://www.energy-manager.ca/vancouver-moving-towards-all-electric-water-heating-for-homes/19 Mar 2026 15:02 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mhgbhbaz622q