Spa Fitter
Sundance Spas Chelsee 780 Replacement Cover
The Sundance Spas Chelsee 780 takes the AIRCAP 1™ Large — a foam-free replacement hot tub cover for square spas 89"–91". The Chelsee 780's cabinet measures 89" x 89", inside the Large's range. The cover weighs 35–40 lb for life, costs $1,195, is engineered to comply with ASTM F1346-23, and carries a 3-year limited warranty.
| Spa cabinet | 89" x 89" |
|---|---|
| AIRCAP 1™ size | Large fits 89"–91" |
| Cover weight | 35–40 lb — constant for life |
| Price | $1,195, free US shipping |
| Skirt | Ziptech™ modular, three lengths included |
| Safety | Engineered to comply with ASTM F1346-23 |
| Warranty | 3-year limited warranty |
Why the Large fits the Chelsee 780
The AIRCAP 1™ comes in six sizes covering square spas from 77" to 94". Each size is built to overhang its band slightly — that is how a spa cover is meant to sit — so the Large, which fits cabinets 89"–91", covers the Chelsee 780's 89" x 89" shell with the right overhang.
At 89" the Chelsee 780 sits at the bottom of the Large's 89"–91" range, so there is room to spare: the same cover fits anything up to 91". Within Sundance Spas, the Chelsee 780 shares that 89" x 89" cabinet with Cameo 880, Hamilton 780, Lisbon 980 and McKinley 680 — same footprint, same cover. Sundance Spas builds the 19 models we fit on 5 footprints, and the Chelsee 780 is on the largest of them; the line spans 5 of the six AIRCAP 1 sizes.
Cabinet dimensions can change between model years. Before ordering, measure your Chelsee 780 at its widest point across the top, in both directions, including any acrylic lip that overhangs the cabinet — the SureFit™ guide walks through it in two measurements. If a figure you have found elsewhere is larger than ours, an overhanging lip is the usual reason. If your spa measures between two sizes, round up.
Every spa in our catalogue that measures 89" x 89" is on one page: hot tubs that take an 89" × 89" cover — the same AIRCAP 1™ Large, at the same price.
How the AIRCAP 1™ is built
Instead of a rigid foam core wrapped in vinyl, the AIRCAP 1™ uses welded drop-stitch construction: a sealed air chamber with no foam to absorb water, so it does not become the waterlogged two-person lift that ends most foam covers. More on how it insulates, how it holds up, and why it is foam-free — or estimate what your current foam cover weighs.
Every Sundance Spas model we fit
| Model | Cabinet | AIRCAP 1™ |
|---|---|---|
| Berkeley | 78" x 78" | XX-Small |
| Brook | 78" x 78" | XX-Small |
| Prado 680 | 80" x 80" | X-Small |
| Altamar 880 | 84" x 84" | Small |
| Bristol 780 | 84" x 84" | Small |
| Edison 680 | 84" x 84" | Small |
| Hanover 780 | 84" x 84" | Small |
| Peyton 680 | 84" x 84" | Small |
| Vistamar 880 | 84" x 84" | Small |
| Constance Select | 88" x 88" | Medium |
| Victoria Select | 88" x 88" | Medium |
| Cameo 880 | 89" x 89" | Large same cover as the Chelsee 780 |
| Chelsee 780 (this page) | 89" x 89" | Large |
| Hamilton 780 | 89" x 89" | Large same cover as the Chelsee 780 |
| Lisbon 980 | 89" x 89" | Large same cover as the Chelsee 780 |
| McKinley 680 | 89" x 89" | Large same cover as the Chelsee 780 |
| Odessa 980 | 89" x 89" | Large same cover as the Chelsee 780 |
| Optima 880 | 89" x 89" | Large same cover as the Chelsee 780 |
| Ramona 680 | 89" x 89" | Large same cover as the Chelsee 780 |
Sundance Spas Chelsee 780 cover: common questions
What size hot tub cover fits the Sundance Spas Chelsee 780?
The Sundance Spas Chelsee 780 takes the AIRCAP 1 Large, which fits square hot tubs measuring 89"–91" across. The Chelsee 780's cabinet measures 89" x 89", inside that band. Measure your spa side to side across the top of the cabinet to confirm before ordering.
Will the AIRCAP 1 fit a Sundance Spas Chelsee 780?
Yes — the Chelsee 780's 89" x 89" square cabinet falls in the AIRCAP 1 Large's 89"–91" range, and the Ziptech modular skirt system ships with three skirt lengths so the drop over the cabinet adjusts without a custom order. Cabinet sizes can change between model years, so confirm with two quick measurements.
How much does a replacement cover for the Sundance Spas Chelsee 780 cost?
The AIRCAP 1 costs $1,195 in every size, including the pump, three Ziptech skirt lengths, and tie-down straps, with free US shipping and 30-day returns. Unlike a foam cover it has no foam core to waterlog, so it stays at its original 35–40 lb weight for life.
How heavy is a replacement cover for the Sundance Spas Chelsee 780?
The AIRCAP 1 Large weighs 35–40 lb and keeps that weight permanently — its sealed drop-stitch air core cannot absorb water. A foam cover starts at 40–75 lb and gains weight as the foam saturates.
Not a Chelsee 780?
The Spa Fitter matches the current models of every major brand to the right AIRCAP 1™ — or measure any square spa with SureFit™.