Mushroom Cold Rooms & Cold Storage — PUF Walk-In Rooms

A mushroom cold room is a modular, walk-in insulated room built from 80mm PPGL PUF panels that holds 2-4°C and 85-90% relative humidity so harvested mushrooms keep for 5-7 days from the pack date instead of 2-3. It is built on site to the capacity your farm needs, from a 2-3 MT room for two or three grow rooms to a 20-50 MT mandi hub.

A small cold room (10×12 ft / 2-3 MT) is ₹3-5 lakh including PPGL PUF panels, refrigeration and racking. A medium room (15×20 ft / 5-8 MT) is ₹6-10 lakh, a large one (20×30 ft / 10-15 MT) ₹10-15 lakh and a commercial hub (30×40 ft / 20-50 MT) ₹15-30 lakh. Ranges are ±15% by location, ex-GST.

Fresh button mushrooms (Agaricus bisporus) are held at 2-4°C — never below 0°C — with 90-95% relative humidity, the tightest band of any common mushroom. Below it they suffer chilling injury; above it they brown and open. Oyster and milky mushrooms tolerate slightly warmer storage, so a room is sized around the button band when the farm grows button.

Pre-cooled within 30 minutes of harvest and held at 2-4°C, button mushrooms keep 5-7 days from the pack date against 2-3 days at ambient in India. Pre-cooling is what reaches that figure; a room without it gives less.

Nothing in the build. 'Cold room' is the modular walk-in room on a farm; 'cold storage' is the same room described by its job — holding produce until dispatch. MushroomWale builds both from the same PPGL PUF panel system and Copeland/Emerson refrigeration; only the capacity and the door and racking layout change.

80mm PPGL (pre-painted Galvalume) PUF sandwich panels for walls and roof — never PPGI — for corrosion resistance at low temperature, food-grade hygiene and a 15-20 year service life. They are the same panel system as the grow rooms, so one supplier and one maintenance routine cover the whole farm.

Copeland/Emerson scroll compressors with an evaporator coil sized for stable 2-4°C operation, a digital temperature controller with alarm, automatic defrost, a strip-curtain door and optional GSM remote monitoring.

A 15×20 ft room on a 3 TR unit draws roughly 18-25 kWh a day — ₹12,000-20,000 a month depending on ambient temperature, tariff and how often the door opens. PUF insulation is what keeps the figure there.

Size it to the daily harvest and the days you accumulate before dispatch. A 10-room farm producing about 3,000 kg a flush needs at least a 15×20 ft (5 MT) room for 3-5 days of accumulation.

Yes. Cold rooms are modular and go up beside existing grow rooms in 2-3 weeks once the civil base is ready; larger commercial rooms take 4-6 weeks. The room is placed between the production area and the loading bay so fresh produce is handled least.

Strongly recommended for button mushrooms. A small pre-cooling chamber removes field heat before mushrooms enter the main room and adds 3-5 days of shelf life. See the cold chambers page for pre-cool plus storage layouts.

Yes, under its own cold-chain item. MIDH pays 35% (50% in special areas) of the cold-storage norm — ₹9. NHB cold storage pays 35% (45% in special areas), capped at ₹2 crore a project. NABARD pays no subsidy; it refinances the loan. MushroomWale prepares the bankable DPR that includes the room; the full cited ledger is on our subsidy page.

It removes same-day selling. Growers accumulate three or more days of harvest and ship one premium load to hotels, retail chains or distant mandis at better prices, and post-harvest wastage falls.