Auroom Mira Review: The Luxury Outdoor Sauna in Large & Small

Evaluated across both the Mira S and Mira L. Model-specific notes are flagged.

The Mira’s defining engineering choice is its wall construction. Where most of our best selling outdoor saunas use a 42mm (1.7") tongue-and-groove shell, the Mira is built from panels roughly 6.1 inches thick with real insulation (CLT). That is why the Mira behaves more like a cabin than a box: it holds heat longer, evens out hot and cold spots, and dampens outside noise. This is a meaningful benefit given the full-glass front, which is the one surface that always leaks heat in saunas.

The exterior is thermally modified Nordic spruce; the interior is knotless thermo-aspen. Thermal modification organically removes resins and sugars, leaving a more stable material that resists rot, pests, and moisture. Independent classifications rate thermo-spruce around Class 1 (25+ years) versus Class 2 (15–25 years) for Western Red Cedar. Aspen matters just as much inside: with virtually no knots or resin, it stays cool to the touch and never blisters or seeps sap at peak temperatures. The front is a single 8mm tempered glass wall with a matching glass door and metal-wood handle, and the interior shows no visible fasteners, creating a perfectly clean, high-end finish.

Auroom offers the Mira in 2 exterior finishes: natural thermo-spruce and a black painted finish.

The Auroom Mira S is a true 1-2 person sauna. Its upper and lower benches plus a footrest, let two adults sit comfortably at different heat levels, but no one is fully reclining across a 52" interior width. It is the right choice for couples, solo bathers, balconies, and tight side-yards.

The Auroom Mira L is the comfort choice. Its two-tier bench spans roughly 6.18 ft, so a six-foot bather can stretch out, and heat zoning between the upper and lower tiers lets a group self-sort by tolerance. Dimmable LED backrest lighting sets the mood in both sizes.

The Mira uses passive ventilation with an intake below the heater and an exhaust vent located under the bench opposite the heater, which follows ventilation best practices. Paired with a floor drain and duckboard flooring to keep sessions fresh. Combined with the thick insulated walls, the room reaches and holds temperature efficiently for a glass-front cabin.

Both sizes support only electrical heaters; not wood-burning heaters. The Mira S pairs well with a compact 4.5-6 kW heater (the HUUM Drop 4.5/6 kW is a common match), which keeps electrical simple. The larger Mira L needs a 10.5 kW heater like the Harvia Virta 10.5 kW, the HUUM HIVE Mini 10.5 kW, and the Saunum AIR L 10 packages. For a full walkthrough of matching output to room volume, see our sauna heater size guide.

The Mira ships as a flat-pack modular kit with pre-clad wall elements and factory-fitted glass. Auroom cites a 4-6 hour build with two people for the Mira S. In practice, this generally takes a full day for the Mira S and a full weekend for a first-time builder on the Mira L. Experienced builders likely can complete the assembly much faster. Lightweight components mean no hoisting equipment is required, which is a real advantage for balconies and courtyards.

One of the other advantages of choosing Auroom is their crate packing. Each component is packed in the order of installation, which is a huge time saver during the assembly process. Having worked on other outdoor sauna installations, this is not the norm. Typically, you’re digging around the crate to find what you need, so the Auroom assembly process is a step higher than almost all other saunas we offer.

What you’ll need that isn’t included: a stable, level foundation (concrete pad, compacted gravel, pavers, or a rated deck); a licensed electrician for the 240V heater circuit plus 120V for lighting and controls; and, for most sites, water management for roof runoff. Every Mira includes a premium accessory bundle, bucket and ladle, thermometer, hygrometer, sand timer, aroma set, sauna hat, and pillow, which is a nice bonus not included with most sauna kits.

The Mira is not a value pick; it sits at the premium end of the modular market. What you pay for is the insulated cabin construction, the fully clad thermo-spruce exterior, factory-fitted glass, the accessory bundle, and hand built Estonian craftsmanship. Here is the out-the-door math for a mid-range Mira L build.

A Mira S build lands much lower: roughly $14,990-$16,290 for the kit, $1,250 shipping, and a smaller 4.5-6 kW heater package ($1,500-$3,500), for an all-in around $18,000-$23,000.

Choose the Auroom Mira if: you value fully insulated walls, thoughtful ventilation and are comfortable paying a premium for superior Estonian build quality.

Choose the SaunaLife CL5G if: you want the best value modern cube with a bronze-glass front and a lifetime cabin warranty. See our SaunaLife CL5G review.

Choose the Dundalk CT Luna if: you prefer a traditional cedar aesthetic and aroma and want the flexibility of an electric or wood-burning heater.

Owner sentiment is consistently positive on build quality, materials, and the airy, bright interior, with the most common criticism being installation-guide clarity and US wiring documentation. This is a documentation issue rather than a build-quality one. Early SaunaKits.com owner reviews echo this: high praise for the product and support, with a request for more specific instructions.

• SaunaLife CL5G Review: Why It’s the Best-Selling Outdoor Sauna of 2026
• SaunaLife Cube Saunas Review: Which Cube Is Right for You?
• How to Choose the Right Sauna Heater Size (kW Guide)
• Shop all Outdoor Saunas

• Auroom Wellness. "Mira - Outdoor Sauna" product page and 2025 Mira product sheet. Verified July 2026. https://auroomwellness.com/product/mira/
• Auroom. Mira S and Mira L Installation Manuals and Limited Warranty. 2026.
• SaunaKits.com. Auroom Mira L and Mira S product pages and specifications. Verified July 2026.
• Thermory / International Thermowood Association. Thermally modified timber durability (Class 1, 25+ years). Industry technical references.
• Western Red Cedar Lumber Association. Western Red Cedar durability classification (Class 2). Verified 2026.