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Last winter, my tiny two-bedroom apartment racked up a $500+ energy bill in one month. Our heaters were fighting the cold drafts (and, likely, improper insulation) and were coming up short. As a result, my roommates and I tried to find a not-entirely-miserable compromise between using them and just layering on sweatshirts and getting into bed right when we got home.

After we got slapped with the electric bill that could power a post-apocalyptic city for three years, we decided we needed to make a more permanent change. So, we started using the mini but all-powerful Dyson Pure Hot + Cool. It shorted out our apartment the first few times because it was drawing too much power, but a cheap $25 investment in this surge protector solved the issue.

The Dyson Pure Hot + Cool takes up minimal room and provides maximum impact. It heats a big room evenly, takes up almost no space, looks much nicer than cheaper models, and has added features that are actually helpful rather than gimmicky, like voice-control, a 7-day schedule, and a nighttime mode.

If the features and long-term savings are worth $600 to you, then this will follow through on its promises. You will get what you pay for, and thanks to the excellence Dyson is known for, you can assume that it will continue to fulfill these promises for years to come (if you actually change the filter every now and then). If something goes wrong, Dyson offers a 2-year warranty of parts and labor, and if you don’t love it, you can return it easily for your money back up to 30 days after your purchase.

My stereotypically tiny New York apartment has limited floor space, and the Dyson impossibly efficient. I barely notice it in the room, but it doesn’t look strictly functional like this cheaper option we considered. Our common space expands into our kitchen, main hallway, and our entryway, and the high ceilings and long, narrow space has always been notoriously hard to heat evenly. Anything small enough to fit would over-bake the living room and not touch the kitchen or dead zone hallway. The Dyson Pure Hot + Cool, with its oscillation and long-range projection, doesn’t have that issue. The awkward maze of rooms all feel evenly heated. For us, this made the Pure Hot + Cool worth the extra money.

The Dyson Pure Hot + Cool also has a night mode, Wi-Fi connectivity, app controls, and a handy remote too. The app is easy to use and has helpful features I’m actually interested in (like air quality), and the night-time mode uses quiet airflow settings. You can set a 7-day schedule on the app and forget about it, letting the Dyson handle temperature on autopilot. You can also set a timer and literally walk into a cozy, warm living space.

It works with Amazon Alexa, and you can use voice control for everything from increasing the airflow speed to turning on the night-time mode. While I mostly cared about the heating and cooling features, it’s also wonderful that the Dyson Pure Hot+Cool also works as an air purifier. It claims to remove 99.97% of pollutants and allergens as small as 0.3 microns with the help of activated carbon granules.

After we started using the Dyson Pure Hot + Cool, our energy bill went from $500 to a small fraction of that. I wish that it was feasible to buy one for every room.

It’s a cringe-worthy investment at $600, but considering that was what we spent on one month alone to heat our apartment, it was a no-brainer for us. If you have more acceptable energy bill costs, it’ll do the same thing (save you money) but the savings might be slightly more modest upfront and just as useful over the long-term.