by The Amerisleep AS3 wins this match-up for most sleepers: it costs about half as much as the Tempur-Adapt Medium, carries a 20-year warranty (twice as long), and its partially plant-based Bio-Pur foam relieves pressure almost as well as Tempur material at a fraction of the price. The Tempur-Pedic TEMPUR-Adapt Medium makes sense in one narrow case: devoted Tempur fans who sleep primarily on their back and value the original NASA-derived foam density above all else.
Amerisleep AS3
9.3/10
- HIVE 5-zone support layer firms under lumbar and shoulders without sacrificing softness at hips
- Partially plant-based Bio-Pur open-cell foam sleeps cooler than dense Tempur material
- CertiPUR-US certified, made in the USA, free FedEx delivery
- 20-year warranty covers manufacturing defects and sagging over 1.5 inches
- From $1,049 queen, less than half the Tempur-Adapt price
- Softer edge support than a coil hybrid
- Sleepers over 230 lb may want the firmer AS5 Hybrid for more long-term support
For side and back sleepers who want genuine memory foam pressure relief without paying Tempur-Pedic prices, the AS3 hits the medium sweet spot with HIVE zoning, a cooler open-cell construction, and a warranty that runs twice as long as the Tempur-Adapt.
Amerisleep AS3 vs Tempur-Pedic TEMPUR-Adapt Medium: at a glance
The table below uses confirmed specs for both mattresses. No figures are estimated.
| Spec | Amerisleep AS3 | Tempur-Pedic TEMPUR-Adapt Medium |
|---|---|---|
| Type | All-foam (Bio-Pur, partially plant-based) | All-foam (proprietary TEMPUR material) |
| Firmness | Medium 5/10 | Medium (medium-firm feel in practice) |
| Height | 12 inches | 11 inches |
| Motion isolation | Excellent (10/10 NapLab) | Excellent (TEMPUR material excels here) |
| Cooling | Open-cell Bio-Pur, above average for all-foam | Cool-to-touch cover, dense foam core runs warm |
| Queen price | From $1,049 | Around $2,199 |
| Sleep trial | 100 nights | 90 nights |
| Warranty | 20 years (10 full, 10 prorated) | 10 years limited |
Why the AS3 wins for most shoppers
Three structural advantages separate the AS3 from the TEMPUR-Adapt in day-to-day use.
Zoned support versus uniform foam. The AS3 uses Amerisleep's HIVE transition layer, which cuts hexagonal patterns at five densities across the mattress. The result is a firmer zone under your lumbar and a softer zone under shoulders, so your spine stays neutral without the mattress forcing your hips and shoulders into the same resistance level. The TEMPUR-Adapt Medium uses a single-density TEMPUR comfort layer without zoning. It conforms beautifully to body curves, but it cannot differentiate support by body zone the way the HIVE layer can.
Cooler construction at the same firmness level. Standard TEMPUR material is dense slow-response foam. That density is what makes Tempur-Pedic famous for pressure relief, but it also traps body heat. The AS3's Bio-Pur foam uses an open-cell structure that dissipates heat faster. Independent lab tests rate the AS3's cooling above average for all-foam mattresses. If you sleep warm, that gap matters over a full night.
Value over the full ownership period. At roughly $1,049 versus $2,199 for queen, the AS3 costs about half as much. Its 20-year warranty is twice as long as the Tempur-Adapt's 10-year policy. The 100-night trial also beats the Tempur-Adapt's 90-night window by ten days.
Independent motion-isolation data supports the AS3 as well. NapLab recorded a 10/10 motion isolation score for the all-foam AS3, with a 2.11 m/sĀ² transfer acceleration, 76 percent better than the category average. Both mattresses handle motion well, but the AS3 achieves that result while providing a cooler, zoned surface at roughly half the price.
If you want the full brand-versus-brand picture across the entire Amerisleep and Tempur-Pedic lineup, our guide to Amerisleep vs Tempur-Pedic covers every model from both companies side by side.
The one case where the TEMPUR-Adapt Medium makes sense
The TEMPUR-Adapt Medium is not a bad mattress. Its proprietary TEMPUR material delivers deep-contouring pressure relief that is genuinely hard to replicate, and if you have slept on Tempur foam before and know you want that specific slow-response sensation, the Adapt Medium is the most accessible entry point in the current Tempur-Pedic lineup.
It suits strict back sleepers who want the heaviest, most conforming foam available and who are not particularly sensitive to sleeping hot. The cool-to-touch cover helps at the surface, but the dense foam core retains more heat than open-cell alternatives overnight.
For that narrow group, loyal Tempur-Pedic customers who primarily sleep on their back and have the budget, the Adapt Medium delivers exactly what it promises. For everyone else, spending roughly $1,150 more for a mattress with half the warranty length and no zoned support is a hard case to make.
Verdict
The Amerisleep AS3 is the clear pick in this comparison. At roughly $1,049 queen it costs about half what the TEMPUR-Adapt Medium costs, carries a 20-year warranty that outlasts the Tempur-Pedic policy by a decade, and delivers zoned support through its HIVE layer that the TEMPUR-Adapt's single-density construction cannot match. The open-cell Bio-Pur foam also sleeps cooler than the dense TEMPUR material.
The TEMPUR-Adapt Medium earns its place on the market for confirmed Tempur-Pedic loyalists, but it is difficult to justify the price premium for a first-time buyer who has not slept on Tempur foam before and has a 100-night trial on the AS3 available at half the price.
The Amerisleep AS3 beats the TEMPUR-Adapt Medium on price, warranty length, zoned support, and cooling. Use the 100-night trial to confirm the medium feel works for your sleep position.
Frequently asked questions
Is the Amerisleep AS3 as good as a Tempur-Pedic?
For most sleepers, yes. The AS3 matches the TEMPUR-Adapt Medium on motion isolation, beats it on cooling, and adds zoned HIVE support that the Tempur-Adapt does not offer, all at roughly half the price with twice the warranty length. If you are specifically attached to the original slow-response Tempur foam sensation, the AS3 is a different feel, but it is not a lesser one.
What is the Tempur-Pedic TEMPUR-Adapt Medium firmness?
Tempur-Pedic labels it Medium, which tends to feel medium-firm to average-weight sleepers in practice. The dense TEMPUR material conforms slowly and deeply, so it works for most sleep positions, but it retains more heat than open-cell foam alternatives overnight.
Does the Amerisleep AS3 have good edge support?
The AS3 has adequate edge support for an all-foam mattress, rated 8.0/10 by NapLab for lying edge support. It is not as firm at the perimeter as a coil hybrid, but it is sufficient for most average-weight sleepers. If perimeter support is a top priority, the Amerisleep AS3 Hybrid upgrades that with a coil core.
How does the warranty compare between these two mattresses?
The Amerisleep AS3 carries a 20-year limited warranty: full replacement coverage for years 1 through 10, then a 50 percent cost replacement option for years 11 through 20, covering defects and sagging over 1.5 inches. The TEMPUR-Adapt Medium carries a 10-year limited warranty. The AS3 warranty is twice as long.
Can I try both mattresses before committing?
Both offer in-home trials. The AS3 comes with a 100-night risk-free trial. The TEMPUR-Adapt Medium includes a 90-night trial. The extra ten nights with the AS3 give you slightly more time to confirm the fit before your return window closes.