78 x 78 Hot Tub Cover — Size, Fit and 68 Spas That Take It
A hot tub measuring 78" × 78" takes the AIRCAP 1™ XX-Small, which fits square spas 77–79". That is the whole answer — but measure your own spa before ordering rather than trusting the size of the cover you are replacing, because cabinets vary between model years and a cover bought to the wrong number is the most common ordering mistake there is.
Measure straight across the top of the cabinet, edge to edge, both ways. If the two numbers differ, use the larger one. If you land between two sizes, round up: an oversized cover overhangs by a fraction, which is how a spa cover is meant to sit, while an undersized one will not seal along the edges.
The AIRCAP 1™ XX-Small fits square spas 77–79" — $1,195, the same as every other size.
Buy the AIRCAP 1™ XX-SmallWhich hot tubs are 78" × 78"?
68 of the 1093 models in our Spa Fitter measure 78" × 78", across 26 brands. If yours is on this list, the size question is settled — click through for its own page.
That makes 78" the 5th most common of the 18 square footprints in the Spa Fitter (68 of 1093, 6.2%); the most common is 84" × 84" with 257. Next door, 77" × 77" lists 11 (plus 1 that rounds up) and 79" × 79" lists 34 (plus 5 that round up). No near-square model rounds up to 78"; every spa above is printed at exactly that. Be Well Canada Spa builds more at this size than anyone else — 10 of the 68; its other 26 square models sit at 83" × 83", 84" × 84", 87" × 87", 89" × 89".
What if my spa is not exactly 78"?
78" (198.1 cm) sits inside the XX-Small band — 77", 78" and 79" all take the same cover, so an exact 78" has room on both sides.
The XX-Small covers everything from 77–79" across, so you do not need to hit 78" exactly. Outside that band, the AIRCAP 1™ comes in six sizes spanning 77" to 94" — the two-measurement guide will place you, or you can look your model up directly in the Spa Fitter.
One limit worth stating plainly: these are covers for square spas. If your cabinet is round, octagonal or a rectangle, no size here will fit it, and the alternatives guide covers what will.
Nearby measurements: 77" × 77" · 79" × 79". Every size from 77" to 94" has its own page, listed on the Spa Fitter.
What a 78" × 78" cover costs
The AIRCAP 1™ XX-Small is $1,195 — the same price as every other size, including the pump, three Ziptech™ skirt depths and tie-down straps, with free shipping to all 50 states. There is no size surcharge, which is unusual in this category: most makers price a cover by its square footage, so a bigger spa costs more. For how that compares with foam and the other constructions, see what a hot tub cover costs.
It weighs 35–40 lb and, with no foam core to absorb water, never gains weight — the one number a foam cover cannot promise.
Frequently asked questions
What size cover fits a 78" x 78" hot tub?
A 78 inch square hot tub takes the AIRCAP 1 XX-Small, which fits square spas 77 to 79 inches across. Measure straight across the top of your cabinet both ways and use the larger number; if it falls between two sizes, round up.
Which hot tubs are 78" x 78"?
68 models in our Spa Fitter measure 78 by 78 inches across 26 brands (Alps Spas, American Spas, Aquaterra Spas and 23 others). Each one has its own page listing the cover size it takes.
Does a 78 inch cover have to be exactly 78 inches?
No. The AIRCAP 1 XX-Small fits any square spa from 77 to 79 inches across, so 78 sits inside the band with room on both sides. Only the larger of your two measurements matters.
How much does a 78" x 78" hot tub cover cost?
The AIRCAP 1 is $1,195 in every size, including the pump, three Ziptech skirt depths and tie-down straps, with free shipping to all 50 states. There is no size surcharge, so a 78 inch cover costs the same as the largest one we make.
Find the size that fits your spa
The AIRCAP 1™ XX-Small fits square spas 77–79" — $1,195, the same as every other size.
Buy the AIRCAP 1™ XX-SmallNot sure of your size? Measure in two steps or look up your model in the Spa Fitter.