Geothermal vs Air Source Heat Pump: Which is Worth It? What if the most efficient way to heat and cool your home might not actually be the best choice for you? Geothermal heat pumps are the gold standard for efficiency. They're also the most expensive upfront investment you can make in your home's HVAC system. So, are they really worth it? Or should you go with an air source heat pump instead? I've been living with my geothermal system for two years now. I reached out to my friend Paul Braren, who installed an air source heat pump system in his home around the same time I was building mine. We're both in New England, we both have detailed energy monitoring, and we both ditched fossil fuels completely. It’s the perfect setup for a real-world comparison. Here's the thing, though. After crunching the numbers, this isn't going to be the straightforward "geothermal wins" or "air source is better" story you might expect. The actual data surprised both of us.

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Paul Braren - After 4 New England Winters Living With Just Heat Pumps - https://tinkertry.com/planning-for-heat-pump-comfort

Watch How 40-Ton Spinning Wheels Are Saving The Power Grid https://youtu.be/Z95t-f-0IjI?list=PLnTSM-ORSgi7uzySCXq8VXhodHB5B5OiQ

Video script and citations: https://undecided.tech/geothermal-vs-air-source-heat-pump-which-is-worth-it/

Get my achieve energy security with solar guide: https://link.undecidedmf.com/solar-guide

Follow-up podcast:

Video version - https://www.youtube.com/channel/UC4-aWB84Bupf5hxGqrwYqLA

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Chapters

00:00 - Intro

01:56 - My Geothermal Journey

02:59 - Paul's Air Source Experience

04:10 - The Contractor Reality

05:17 - Living With The Systems

08:27 - The Dehumidifier Situation

09:13 - The ERV Integration Issue

10:32 - The Data Showdown

12:53 - Seasonal Performance

14:25 - The Cost Question

16:46 - The New England Challenge

17:32 - When Each System Makes Sense

How a Mechanical Battery Could Prevent Deadly Blackouts. Go to https://surfshark.com/undecided or use code UNDECIDED at checkout to get 4 extra months of Surfshark VPN! When Spain's power grid failed on April 28th, 2025, it quickly became a very serious issue. Not only for the economic impacts, but life-or-death serious due to multiple, indirect deaths associated to the blackout. Emergency services, transportation, communication and other vital services were halted during this power outage. Not only did it blackout Spain, it also hit Portugal, parts of France and Morocco. But here's the thing … the UK went through something very similar back in 2019. The difference is: they've already figured out how to stop it from happening again. Spoiler: it involves 40 metric ton flywheels. Lots of them. We've covered flywheels before. But there's a wild new use case involving technology originally designed for space lasers. Yeah, you heard that right.

Watch What This Aluminum‑Ion Breakthrough Means for You https://youtu.be/svHeBLgpRQs?list=PLnTSM-ORSgi7uzySCXq8VXhodHB5B5OiQ

Video script and citations: https://undecidedmf.com/how-40-ton-spinning-wheels-are-saving-the-power-grid/

Get my achieve energy security with solar guide: https://link.undecidedmf.com/solar-guide

Follow-up podcast:

Video version - https://www.youtube.com/channel/UC4-aWB84Bupf5hxGqrwYqLA

Audio version - http://bit.ly/stilltbdfm

Join the Undecided Discord server:

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👋 Support Undecided on Patreon!

https://www.patreon.com/mattferrell

⚙️ Gear & Products I Like

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Visit my Energysage Portal (US):Research solar panels, heat pumps, and more to get quotes for free! https://undecided.link/energysage

For a curated solar buying experience (Canada) EnergyPal's free personalized quotes: https://energypal.com/undecided

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I may earn a small commission for my endorsement or recommendation to products or services linked above, but I wouldn't put them here if I didn't like them. Your purchase helps support the channel and the videos I produce. Thank you.

What This Aluminum‑Ion Breakthrough Means for You. Take your personal data back with Incogni! Use code UNDECIDED at the link below and get 60% off an annual plan: http://incogni.com/undecided Your lights just flickered. Not for long. Just a split second. You probably didn't think much about it, but somewhere a battery may have just saved your city from a blackout. These kinds of batteries are for preventing the entire electrical grid from collapsing. And it turns out, the batteries doing this job need to be fundamentally different from the ones we've been talking about for years. A German research institute has built a battery that responds faster than you can blink. It's made from cheap, abundant aluminum instead of lithium, and it doesn't use a flammable electrolyte. In real-world grid tests, it reacted instantaneously to smooth out power fluctuations that would have caused widespread blackouts. But can a battery designed for speed and power instead of range actually scale into the grid-stabilizing role we desperately need?

Watch The 90% Price Crash That Changed Everything https://youtu.be/nrTCgZmUFCY?list=PLnTSM-ORSgi7uzySCXq8VXhodHB5B5OiQ

Video script and citations: https://undecidedmf.com/why-aluminum-batteries-could-beat-lithium/

Get my achieve energy security with solar guide: https://link.undecidedmf.com/solar-guide

Follow-up podcast:

Video version - https://www.youtube.com/channel/UC4-aWB84Bupf5hxGqrwYqLA

Audio version - http://bit.ly/stilltbdfm

Join the Undecided Discord server: https://link.undecidedmf.com/discord

👋 Support Undecided on Patreon! https://www.patreon.com/mattferrell

⚙️ Gear & Products I Like https://undecidedmf.com/shop/

Visit my Energysage Portal (US): Research solar panels, heat pumps, and more to get quotes for free! https://undecided.link/energysage

For a curated solar buying experience (Canada) EnergyPal's free personalized quotes: https://energypal.com/undecided

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Website https://undecidedmf.com

Some music provided by Epidemic Sound http://bit.ly/UndecidedEpidemic

I may earn a small commission for my endorsement or recommendation to products or services linked above, but I wouldn't put them here if I didn't like them. Your purchase helps support the channel and the videos I produce. Thank you.

Chapters

00:00 - Intro

06:22 - The Dual Ion Design

08:39 - The Aluminum Advantage

09:11 - The System Design Breakthrough