In a cold storage building, the doors are the weak point. Every time one opens, warm, moist air rushes in. That air costs energy to cool, and its moisture turns to condensation, frost and ice — on coils, on floors and around the door itself. The ASHRAE Refrigeration Handbook notes that cooling coils located above doorways draw in warm, moist air and frost quickly (ASHRAE).
The fix isn’t one product. It’s the right door at each opening, from the freezer room to the loading dock.
Key takeaways
- Use a high-speed freezer door on busy openings between temperature zones. It limits how long the opening stays open, and heated, sealed guides limit condensation.
- Use highly insulated overhead doors on exterior and perimeter openings.
- Add low-temperature strip curtains or impact doors where people, carts and pallet jacks pass often.
- At the dock, a well-fitted dock seal limits infiltration around the trailer.
Why cold storage doors are different
- Infiltration. Open doors let warm air in and cold air out. An efficiency program run by Energy Trust of Oregon calls minimizing air infiltration through open doors and loading docks “a cost-effective way to improve energy efficiency” (Energy Trust of Oregon).
- Condensation and ice. Moisture freezes on door tracks, seals and floors, which jams doors and creates slip hazards. ASHRAE recommends that “all doors to rooms operating below freezing should be equipped with heaters” (ASHRAE).
- Traffic. Forklifts and pallet jacks run through these openings all day, so doors take hits.
Freezer and cooler openings: high-speed doors
On a busy interior opening between a freezer and a staging area, a high-speed door is the core of the system. Our Interior High Speed Freezer and Cooler Door (997) is built for openings “where temperatures vary greatly on either side of the door opening”:
- Insulated curtain — two layers of PVC-coated polyester plus conductive and radiant insulation, to limit heat loss and condensation.
- Heated, sealed guides — actively heated to a uniform temperature along their full height for smooth door movement, and quad-sealed and insulated to prevent guide condensation and loss of conditioned air, with heater and blower power built into the control panel. A heated air curtain is optional.
- Fast cycling — closes at up to 40 in/sec, so the opening is open for less time.
- Forklift-friendly — a breakaway bottom bar resets from either side after contact.
- Safety — infrared sensors and a wireless reversing edge.
The 997 runs on three-phase power (230, 460 or 575V), so plan the electrical work early.
Exterior and perimeter openings: insulated overhead doors
Exterior doors on a cold building need high insulation and tight seals. When we plan cold storage openings, these are the models we look at first:
- AM850 Super Insulated Overhead Door — R-26, with 3″ foamed-in-place insulation, a 1¾” PVC thermal break on the end stiles, dual-barrier joints and a low air infiltration rate (0.09 cfm/ft² at 15 mph). An optional EPDM outer bulb seal is recommended for extreme conditions.
- AM599 Extra Insulated Overhead Door — R-17.5, with a PVC thermal break and header and jamb seals standard.
- AM625 Insulated Roll Up Door — R-7.7, for openings where a rolling door fits better. An optional air infiltration package adds guide covers, dual brush guide seals, a lintel seal and a bottom astragal.
For a detailed model comparison, see Insulated Overhead Door – How to Choose the Right One.
High-traffic personnel and cart openings
- Flexible vinyl strip curtains — our Low-Temp formula stays flexible down to -40°F and suits freezers and USDA-inspected sites (indoor use). ENERGY STAR says strip curtains “can cut outside air infiltration by about 75 percent” at walk-in coolers (ENERGY STAR). Real-world savings depend on how the opening is used — a curtain that’s tied back stops doing its job.
- Impact swinging doors — let personnel, carts, pallet jacks and forklifts pass between temperature zones. They open with less than 1 pound of pressure and close behind traffic to keep conditioned air in.
If your facility includes walk-in coolers or freezers (smaller self-contained rooms, as opposed to warehouse-scale cold storage), they have their own federal requirements. US Department of Energy rules require walk-ins to have “strip doors, spring hinged doors, or other method of minimizing infiltration when doors are open,” along with minimum insulation levels (10 CFR 431.306).
The loading dock
Refrigerated trailers lose cold air at the dock gap. ASHRAE notes that “cushion-closure seals around the truck doorways reduce infiltration of outdoor air,” and recommends avoiding gaps beneath the leveler plate (ASHRAE).
- Dock seals compress against the trailer for the tightest fit. Our Head Curtain Dock Seal adjusts to varying trailer heights and keeps “outdoor contaminants out and conditioned air in.”
- Dock shelters suit mixed fleets. See dock seals vs. dock shelters to choose.
- Pair the seal with an insulated dock door and a vehicle restraint — trailers that creep away from the dock open the gap again. See our loading dock safety checklist.
Planning checklist for a cold storage project
- Map every opening by temperature on each side and daily traffic
- High-speed freezer doors on the busiest freezer and cooler openings
- High-R insulated doors with full perimeter seals on exterior openings
- Low-temp strip curtains or impact doors for personnel and cart traffic
- Dock seals sized to your trailers, with insulated dock doors
- Three-phase power at high-speed door locations
- Heaters on doors to rooms below freezing, per ASHRAE guidance
Common questions
What’s the best door for a freezer entrance with forklift traffic?
A high-speed freezer door, such as our 997, designed for openings with a large temperature difference. Its heated, sealed guides limit condensation, and its breakaway bottom bar resets after forklift contact.
Are strip curtains enough on their own?
It depends on traffic. Strip curtains are a low-cost way to cut infiltration at personnel and cart openings. On busy forklift openings between freezer and warmer zones, a high-speed door limits how long the opening is exposed.
Which insulated overhead door has the highest R-value?
Among our models, the AM850, at R-26.
Plan your cold storage doors with us
We install and service high-speed doors, insulated doors, strip curtains, impact doors and dock equipment across the five boroughs, Long Island, Westchester and Rockland. Contact us to plan your openings.
