Cooling gear guides, without the hype. Portable ACs, window kits, tower fans, neck fans, cooling towels: each guide says what works, what does not, and who should skip it. Dated prices, real specs.
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Tools: Size an AC · Heat index
What size do you need?
Two questions; sized with ENERGY STAR’s table, then the unit here that fits.
Where this number comes from
A sizing guide built from ENERGY STAR’s published table, not a full Manual-J load calculation. For odd rooms (lots of glass, top floor, extreme climates) an HVAC pro’s load calc is worth it.
Heat-index & humidity checker
Enter temperature and humidity: the feels-like heat index, the NWS level, and whether evaporative cooling helps.
Where this number comes from
Heat index uses the National Weather Service Rothfusz regression. Live readings come from api.weather.gov (US only, public domain) and stay in your browser — we don’t store your location. Not medical advice.
Cooling gear is one of the most over-marketed corners of the home. “Hose-free air conditioners” are usually evaporative coolers that only work in dry air; “bladeless” fans still have a blade, just a hidden one; and the spec sheets mix two different BTU standards so units look more powerful than they are. None of that is illegal, but it is designed to be confusing.
Our approach is boring on purpose. We verify every spec against the manufacturer’s own page, stamp every price with the date we saw it, and say plainly when a product is the wrong tool — an evaporative cooler in Houston, a spot cooler sold as a room cooler, a recalled window unit. If the cheapest honest answer is a $40 vent kit and the AC you already own, we say that too. And when the honest answer isn't a machine at all — a $17 cooling towel or a wearable neck fan you clip on for a commute — we cover that too. The goal is that you buy once, correctly, not that you buy the most expensive thing on the page.
Size it before you buy
The single most common mistake is buying the wrong capacity. For a compressor air conditioner (window, portable or U-shaped), this applies ENERGY STAR’s official sizing table and adjustment rules. Evaporative coolers are rated in airflow instead — for those, the CFM sizing tool uses the US Department of Energy’s own formula.
Before you buy anything: is it even that hot?
Half of “I need an air conditioner” situations are really “this room is stuffy.” Before spending real money, check the actual heat index where you are and whether a fan or an evaporative cooler will do the job — the checker below runs the National Weather Service’s own formula and tells you honestly when moving air stops being enough.
Not shopping yet?
How to stay safe in extreme heat — the free, no-purchase version: what the heat-index bands mean, when a fan becomes dangerous, and who’s most at risk.
El Niño 2026–27 tracker — the latest official NOAA data on the developing event (updated monthly), and an honest read of what it does (and doesn’t) mean for your weather.
Questions people actually ask
Do I need an air conditioner, or will a fan do?
A fan doesn't lower the room's temperature — it moves air so you feel a few degrees cooler, which is enough until the heat gets serious. Once the National Weather Service heat index climbs into the caution bands, moving hot air stops helping and you need refrigeration (a window, portable or U-shaped AC) or a cooler space to move to. The free heat-index checker on this page runs the NWS formula and tells you honestly which side of that line you're on.
What's the cheapest thing that actually makes me cooler?
If you don't need to cool a whole room, the cheapest honest option is a cooling towel — about $17, no battery, wet-wring-snap-drape — followed by a wearable neck fan for hands-free air on a hot commute. Neither lowers room temperature; they cool your body directly. For a room, the cheapest correct answer is often a roughly $40 vent kit for an AC you already own rather than a new unit.
How do you choose products — do you test them hands-on?
We research and price-check every product against the manufacturer's own page and stamp the date we saw the price. We do not claim hands-on testing unless we actually had the unit in hand — where we didn't, we say so. And when a product is the wrong tool — an evaporative cooler in humid air, a spot cooler sold as a room cooler, a recalled window unit — we say so plainly, even if it costs us a sale.