Amerisleep AS3 vs Beautyrest Harmony Lux Carbon Medium Pillow Top
Detailed side-by-side comparison — pricing, specs, performance ratings, and our pick.
Pricing unavailable — visit Amerisleep for current rates
Check current price at Amerisleep →Pricing unavailable — visit Beautyrest for current rates
Check current price at Beautyrest →| Feature | Amerisleep AS3 | Beautyrest Harmony Lux Carbon Medium Pillow Top |
|---|---|---|
| Overview | ||
Type | Memory Foam | Hybrid |
Firmness 1 = softest, 10 = firmest | 6 / 10 | 5.5 / 10 |
Queen Price Current / sale price | Check retailer | Check retailer |
Trial Period Return window | 100 nights | 100 nights |
Warranty | 20 years | 10 years |
| Performance Ratings | ||
Cooling Hot sleepers | Moderate | High |
Motion Isolation Partners, light sleepers | Good | Excellent |
Pressure Relief Hip/shoulder pain | Good | Good |
Edge Support Sit/sleep near edge | Fair | Good |
Durability Long-term performance | Good | Good |
| Compatibility & Features | ||
Adjustable Base Head/foot elevation | ✓ Yes | ✓ Yes |
Split King Support Two Twin XL per couple | ✓ Yes | — |
Dual Comfort Zones Different firmness per side | — | — |
Smart Features App, sensors, auto-adjust | — | — |
Financing | Affirm | Synchrony, Affirm |
| Materials & Safety | ||
Certifications Organic / non-toxic | CertiPUR-US | CertiPUR-US, SEAQUAL |
Off-Gassing New-foam smell concern | CertiPUR-US certified foam | CertiPUR-US certified foam |
| Best For | ||
Ideal sleeper profiles |
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| Actions | ||
Need Help Deciding?
For most sleepers, we recommend the Amerisleep AS3 over the Beautyrest Harmony Lux Carbon Medium Pillow Top. It scores higher in cooling, price-to-value and delivers stronger overall value. The Beautyrest Harmony Lux Carbon Medium Pillow Top is the better choice only if you have a strong preference for that brand's specific feel or design.
Amerisleep AS3 vs Beautyrest Harmony Lux Carbon Medium Pillow Top: What Actually Differs
The Amerisleep AS3 is a memory foam build, while the Beautyrest Harmony Lux Carbon Medium Pillow Top is a hybrid — that single difference drives most of the cooling, motion, and feel decisions below. The Beautyrest Harmony Lux Carbon Medium Pillow Top stands 15.75" tall versus 12" for the Amerisleep AS3 — a 3.8" gap that matters if you need deep-pocket sheets or are pairing with an adjustable base. Both sit at roughly 6/10 on the firmness scale — a medium-firm feel — so neither one is the answer if you need a dramatically different support level. The single largest performance gap is in motion isolation: the Beautyrest Harmony Lux Carbon Medium Pillow Top rates noticeably higher than the Amerisleep AS3, which is the deciding factor if that dimension is high on your list. On a Queen, the Amerisleep AS3 runs $999 versus $1,149 for the Beautyrest Harmony Lux Carbon Medium Pillow Top — roughly $150 (13%) less, which is enough to factor into the decision unless the pricier model wins clearly on the specs you care about.
Which Is Better For Your Sleep Style?
Both rate the same for pressure relief — choose on firmness instead (side sleepers usually prefer the softer of the two: Beautyrest Harmony Lux Carbon Medium Pillow Top at 5.5/10).
Firmness of 6/10 is closer to the medium-firm sweet spot back sleepers need for lumbar support (vs 5.5/10).
Firmer at 6/10 vs 5.5/10 — stomach sleepers need the extra support to keep the pelvis from sinking and arching the lower back.
Cooling rating not available for one or both mattresses — spec not available.
stronger perimeter / edge support — the two specs heavier sleepers should weight most.
Softer at 5.5/10 vs 6/10 — lighter sleepers compress less, so they typically need the softer of two options to get proper contouring.
Higher motion-isolation rating, which means less disturbance when a partner moves or gets out of bed.
Price Comparison (Queen)
| Mattress | MSRP | Current | Sale? |
|---|---|---|---|
| Amerisleep AS3 | $1,499 | $999 | Save $500 |
| Beautyrest Harmony Lux Carbon Medium Pillow Top | $1,399 | $1,149 | Save $250 |
The Amerisleep AS3 is the budget choice at $999 — $150 less than the Beautyrest Harmony Lux Carbon Medium Pillow Top ($1,149). That's a 13% gap, which is worth weighing against the spec differences before deciding which delivers better value for your situation. Both are currently below MSRP.
Amerisleep AS3
Strengths
- ✓Plant-based Bio-Pur foam
- ✓20-year warranty
- ✓Good pressure relief
- ✓Responsive feel
Considerations
- —Higher MSRP (frequent sales)
- —100-night trial (shorter than some)
- —Limited edge support
Beautyrest Harmony Lux Carbon Medium Pillow Top
Strengths
- ✓InfiniCool Lux cooling technology
- ✓T2 pocketed coils for airflow
- ✓SEAQUAL ocean-plastic fabric cover
- ✓100-night trial
Considerations
- —DISCONTINUED Aug 19, 2025 — clearance only
- —Replaced by Beautyrest Black/Pressure Smart lines
- —Limited inventory — verify availability before publishing links
Who Should Buy Which?
Choose the Beautyrest Harmony Lux Carbon Medium Pillow Top if you…
- →Couples / light sleepers
- →Sitting near the edge
- →Organic / non-toxic priority shoppers