When summer hits, many Australians rely on air conditioning to cool bedrooms overnight. But the running costs can be steep, especially during heat waves. What if there were a more targeted, lower-consumption alternative?
Enter the OAK SLEEP HUB 2. In cooling mode, it draws a maximum of ~220 W — much lower than most AC systems. This blog unpacks a side-by-side cost comparison: HUB 2 vs air conditioner (100% use scenario), with assumptions, real electricity pricing, and key caveats. By the end, you'll understand where the savings lie — and whether HUB 2 is a smarter choice for sustainable, cool sleep.
Key Assumptions & Parameters
To make this comparison clear and fair, we use conservative assumptions:
| Parameter | Value / Assumption |
|---|---|
| HUB 2 max power draw (cooling mode) | 220 W = 0.22 kW |
| AC system size (split system, medium bedroom) | 2.5 kW to 3.5 kW typical |
| Electricity cost in Australia | ~A$0.33 per kWh (average) (Finder) |
| Usage duration | 8 hours per night, 30 nights (full month) |
| AC efficiency & variability | AC may use 0.8–2.5 kW depending on load and model (Choice) |
| 100% use means continuous operation (no cycling off) | Worst-case baseline |
These assumptions err on the conservative side to avoid overstating savings.
Electrical Cost Breakdown: HUB 2 vs AC
HUB 2 Cost Estimate
- Power draw: 0.22 kW
- Hours per night: 8
- Monthly consumption: 0.22 × 8 × 30 = 52.8 kWh
- Cost @ A$0.33/kWh → 52.8 × 0.33 = A$17.42 per month
Thus, running HUB 2 at full cooling power all night costs ~ A$17–18/month (in our baseline scenario).
Air Conditioner Cost Estimate (Split System Example)
For a 2.5 kW split AC, using moderate load factors:
- If AC draws ~1.5 kW (average, adjusting for compressor cycling)
- Hours per night: 8
- Monthly: 1.5 × 8 × 30 = 360 kWh
- Cost @ A$0.33/kWh → 360 × 0.33 = A$118.80 per month
Even with a more efficient AC or lower load, AC running costs commonly range between A$80 to A$150+ per month in summer. (Solar Choice) (Choice)
For example, Solarchoice publishes estimates assuming A$0.30/kWh and typical usage:
- 2.5 kW split system AC ~ A$25 per month (4h/day) Solar Choice
-
But when used continuously (8h) that doubles → ~A$50+
Yet many ACs in real life run above 1.5 kW under load, pushing costs higher.
Comparative Summary
| Device | Estimated Monthly Energy Use | Estimated Monthly Cost |
|---|---|---|
| HUB 2 (0.22 kW, 8h/day) | ~52.8 kWh | ~ A$17–18 |
| Split AC (~1.5 kW average) | ~360 kWh | ~ A$118–120 |
| High-demand AC (2.5–3 kW) | 600–720 kWh | A$200+ |
Even in a worst-case scenario (AC being more efficient), the HUB 2 cost is < 20% of AC cost.
This doesn’t account for:
- AC’s startup / peak power draw (which may be higher)
- Inefficiencies of space cooling (cooling air volume vs mattress surface)
- Additional cost factors like duct losses, insulation, ambient heat load
Thus, HUB 2 offers a compelling efficiency advantage — cooling only where you sleep.
Why the Savings Are Real (and Not Just Theoretical)
1. Targeted cooling vs ambient cooling
AC cools the entire room (walls, air, furniture) — even unoccupied space. HUB 2 focuses only under you, greatly reducing wasted cooling.
2. Less cycling overhead
AC units cycle on/off, consuming bursts of power above their average draw. Continuous mattress cooling avoids repeated compressor start-ups.
3. Efficiency losses & insulation
Rooms lose cooled air through leakage, windows, walls. AC must overcome these. HUB 2 is less impacted by structural inefficiencies since it's local.
4. Modern grid volatility & rising energy costs
Wholesale electricity prices have surged, with generation constraints and power demand driving higher retail tariffs. The Australian
Thus, relative savings matter more over time.
How This Impacts You as a Buyer
- You can run cooling all night at lower cost and risk of high bills.
- You reduce reliance on whole-room AC during warmer months.
- Over 3 months of summer, the difference could be A$300+ in running cost.
- The energy savings can partially offset the cost premium of quality tech.
Practical Tips to Maximise Efficiency Using HUB 2
- Pre-cool before bed
- Keep ambient doors closed, windows shaded. Add window ventilation when external temp is lower than internal.
- Ensure good mattress insulation (protective layers)
- Occasionally allow warmer cycles to reduce condensation
Conclusion
In a direct apples-to-apples 100% use scenario, the HUB 2 (220 W cooling pad) uses a fraction of the energy compared to an air conditioner. Even under conservative assumptions, it costs ~A$17–18/month vs A$100+ for a standard split AC.
When you combine that with better targeted comfort, subscription-free design, local support, and less energy waste — the economic argument strongly supports HUB 2 as a smarter, more efficient cooling solution for summer sleep.
Sleep cool. Save cost.
Note: We recommend using the HUB 2 in a room at 24°C or below. If you wish to use the HUB 2 in a room temperature higher than this, you may find limited cooling capacity. Pair with AC for best outcome.
Note: On warmer nights 20°C+, if not using AC, cross-ventilation is essential. Please ensure you can open window/s.
🔗 Related Blogs
- Best Alternatives to Eight Sleep (2025 Guide)
- Australian Summer Survival: How to Sleep Through Heatwaves
- Best Cooling Mattress Pad in Australia: Sleep Better This Summer
- Menopause & Sleep: How Temperature Control Can Relieve Night Sweats
- OAK SLEEP HUB vs. EIGHT SLEEP Pod: Which One Should You Choose?
FAQ
Q. Is 220 W a realistic “max” draw?
Yes — that’s the specified peak cooling mode. In typical use, many nights will draw less, especially during stable conditions.
Q. What if my AC is a super efficient inverter model?
Even efficient ACs operate above 1 kW under load, so the relative savings still tend to favour HUB 2 — though the margin narrows.
Q. Can I disable heating to save energy?
Yes — you only activate cooling when needed; heating mode is independent and optional.
Q. Should I rely solely on HUB for all summer cooling?
It’s ideal for bed zone cooling, but in high ambient heat 24°C or higher, a small AC or fan may supplement. But overall energy cost may remain much lower.