All three of these are automated mushroom fruiting chambers, which means they manage the humidity and fresh air exchange that fruiting demands so you are not misting by hand. The differences are scale, climate control, and who each one is built for. The short version: the Mella is the smallest and most countertop-friendly, the North Spore BoomRoom is the largest, and the Midwest Ecosphere 3.0 sits in the middle while adding active heating the other two underplay.
I've run automated and manual setups side by side, and the feature that separates a chamber that fruits consistently from one that struggles is rarely humidity alone. It is whether the system also holds temperature. That single point shapes most of this comparison.
Quick Comparison: Mella vs BoomRoom vs Ecosphere
Midwest Ecosphere 3.0Mella: The Countertop Chamber
The Mella, built by GE Appliances' FirstBuild, is the most design-forward of the three. It is a 25 pound countertop unit with clear acrylic walls and a stainless frame, sized to hold up to four fruiting blocks, though three 5 pound blocks is the comfortable real-world fit. Its external water tank runs five to seven days between refills, and humidity is set with knobs on top.
Where the Mella wins is footprint and looks. It fits on a kitchen counter and runs quietly, which is exactly right for someone growing a block or two of gourmet mushrooms as a hobby. Its limit is the same as its strength: it is small, and it focuses on humidity and air rather than active heat, so a cold kitchen can still slow fruiting.
North Spore BoomRoom: The High-Capacity Tent
The BoomRoom is a Martha-tent-style system, and it is the biggest of the three by a wide margin: 18 cubic feet across five full racks, with room for up to four blocks or roughly 20 pounds of substrate per rack. North Spore positions it as growing many times more than a single monotub, and that capacity claim is the point of the product.
It automates humidity, CO2, and fresh air exchange with an ultrasonic mister, and the vinyl tent enclosure keeps the whole thing waterproof. If raw output is your goal, this is the volume leader. The trade-offs are the ones every tent carries: it takes more floor space, and a soft-sided tent holds temperature less tightly than a framed greenhouse cabinet.
Midwest Ecosphere 3.0: The Balanced Pick
The Ecosphere 3.0 lands between the Mella and the BoomRoom on size, with 17.7 cubic feet and four customizable tiers in a clear zippered greenhouse on a green frame. On capacity alone it is closer to the BoomRoom than the Mella.
Its real separator is the 200W infrared heating element. The Mella and BoomRoom lead with humidity and air exchange, but the Ecosphere actively manages temperature too, paired with a brushless fan, a 3L Monsoon humidifier, programmable timers, and LED lighting. For growers in a cool basement or garage, or anyone fruiting species that want consistent warmth, that heat control is the difference between guessing and setting a number. The Foundation Edition covers the same core climate approach at a lower entry point, and the wider Midwest Grow Kits range is built around this automated path.
Which Automated Mushroom Chamber Should You Buy?
My verdict, by use case:
- Smallest footprint and best looks: the Mella, for one to four blocks on a counter.
- Maximum capacity: the BoomRoom, when raw output is the goal and you have the floor space.
- Most balanced and best in a cool room: the Ecosphere 3.0, because active heating plus humidity holds steadier conditions for repeat, multi-tray grows.
For most growers past the hobby-block stage who want one system to run consistently, I'd take the Ecosphere. It gives up some of the BoomRoom's raw volume but adds the temperature control that keeps grows predictable. If you want a smaller automated tub instead of a full chamber, the MycoClimate automated monotub covers that footprint, and the full mushroom grow tent lineup shows the framed-greenhouse options. For deeper background on the whole system ladder, see the mushroom grow kit guide.
Frequently Asked Questions
- What is the best automated mushroom fruiting chamber for a small space?
- The Mella is the most compact, sized for a kitchen counter and one to four fruiting blocks. If you need a bit more capacity but still want a self-contained unit, the Ecosphere 3.0 greenhouse holds four tiers in a footprint that fits most spare rooms.
- What is the difference between the BoomRoom and the Ecosphere?
- The BoomRoom is a larger soft-sided Martha tent built for maximum capacity with humidity, CO2, and fresh air control. The Ecosphere 3.0 is a framed greenhouse with slightly less volume but adds a 200W infrared heating element, so it actively manages temperature as well as humidity.
- Do automated mushroom chambers control temperature?
- Not all of them. Most lead with humidity and fresh air exchange. The Ecosphere 3.0 is one that includes an infrared heating element, which matters for cool rooms and warmth-loving species where humidity control alone is not enough.
- Are these automated chambers worth it over a monotub?
- For repeated grows or multiple trays, yes, because they remove the daily misting and fanning that sink most manual setups. For a single first grow, a monotub or a manual chamber teaches you more for far less. An automated monotub is a middle ground that keeps the tub footprint while adding climate control.
- Which chamber is best for a cold basement or garage?
- One with active heating. The Ecosphere 3.0's infrared element lets you hold a target temperature in a cool space, where humidity-only systems like the Mella and BoomRoom can stall when the ambient room runs cold.
