
SEBO
AIRBELT E3 Premium
Ultra-durable, 10-year warranty, but expensive with short cord.

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The Hoover Windtunnel XL. I have one for just because but it proved its mettle when we moved into a rental home that, we were told, had been professionally cleaned and the carpet was new. Nope. Previous occupants had two Great Pyrenees who spent a lotta time indoors. The carpet was such that it effectively hid the fur until I got busy with the vacuum. ASTONISHING amount of fur and dander collected. This unit also has a washable double filter that makes a huge difference in maintaining the level of effectiveness. Also, I have a commercial-grade, body-carried cannister vacuum (also Hoover). It works miracles on hard-surface floors and upholstery, and carpet edges and baseboards. The cash outlay is an investment ($130 for the cannister, $100 for the upright) but there's a lot of comfort in knowing these two can tackle almost anything.
Hoover smartwash pet complete. The best carpet cleaner I've ever owned. You can buy refurbished from BestBuy.
KPA is a marketing term to boost sales of inferior machines. CFM, water lift (sealed suction) and watts are the terms that differentiate models for comparison. At $250, these factors will mean less as you aren't likely to find a sealed suction machine. Options from Eureka Mighty Mite, Oreck XL, Kenmore 200, and Hoover Windtunnel may have what you want. All of these are included in this sub's link to recommended cleaners. A used Kirby would be high on my list at your price point as well.
I have 2 Hoover Windtunnels. Work great very old. I have 3 working Shark Robot vacs. Oldest is 12 yrs old. Still using all 3 on each level of house.
My Hoover wind tunnel just died and it was not working great so looking for something different. 1500 sqft house half wood floors and half low pile carpet. Three cats so there is a lot of cat hair too. Budget is flexible. Up to $1k if it’s worth it but would prefer to pay less. Need to have attachments to get cobwebs down off the ceilings occasionally.
I’ve used the Hoover Windtunnel, then the Dyson Ball Animal 2, before finally settling on the Sebo X 7 Premium. It’s the best vacuum cleaner I’ve ever owned, and it’s my final upright for the foreseeable future.

SEBO
AIRBELT E3 Premium
Ultra-durable, 10-year warranty, but expensive with short cord.

Numatic International
Henry Canister Series
Budget king, super durable, but heavy and poor on carpets.

SEBO
AIRBELT D4 Premium
Durable, powerful, long cord, but heavy and pricey.

SEBO
FELIX Premium
Durable, powerful, good for allergies, but heavy with awkward attachments.

Miele
Classic C1 Cat & Dog PowerLine
Durable, powerful, quiet, but very expensive, short cord.

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
Numatic International - Henry Canister Series

Ranked #1
Dyson - V15 Detect Series