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Air Handling Units built to run on 100% fresh air, not recirculated room air — from Degree Day’s D-Series and DX-Series ranges. Below: what each one does, real specs, and — at the end — a straight answer on which fits hospitals, hotels & banquets, and schools.
We run a free site survey and recommend D-Series, DX-Series, or a mixed layout — based on your building, footfall and season.
A high-performance double-skin AHU combining indirect and direct evaporative cooling. It draws 100% fresh outdoor air, cools it in two stages, and supplies it without adding refrigerant, compressors or recirculated air — an eco-friendly, low-running-cost alternative to conventional AC for dry and moderate climates.
| Airflow range | 1,000 – 40,000 CFM modular units · up to 200,000 CFM for built-up structures |
|---|---|
| Supply air temperature | As low as 18°C, room temperature 22–24°C at 55–65% RH in peak summer |
| Power consumption | As low as ~20% of a conventional AC system |
| Static pressure | 250 to 1,500 Pascals, selectable |
| Filtration | 20 micron to 0.3 micron options |
The DX-Series is Degree Day’s upgrade over the D-Series for mid-to-large spaces — a hybrid AHU that intelligently switches between evaporative cooling and full air-conditioning, sensing wet-bulb and room temperature, so one machine gives you year-round comfort instead of two separate systems.
Fresh-air circulation at the lowest possible running cost — the same low-power stage as D-Series, used whenever outdoor wet-bulb conditions allow it.
Switches over automatically in hot, humid conditions to deliver temperature-controlled comfort — can integrate with an existing chilled-water plant to cut costs further.
| D-Series | DX-Series | |
|---|---|---|
| Cooling method | Two-stage evaporative only (indirect + direct) | Hybrid — evaporative + full AC, auto-switching |
| Best climate fit | Dry & moderate climates, peak Apr–Jun heat | Year-round, including humid monsoon spells |
| Running cost | Lowest — as low as ~20% of conventional AC | Low on average — AC mode used only when needed |
| Comfort in humid weather | Comfort settles ~28–30°C | Full AC-level comfort maintained |
| Typical use here | Schools, back-of-house, dry-season crowd cooling | Hospital OPDs, hotel & banquet guest areas |
Best fit: DX-Series for OPD halls, corridors and visitor waiting areas — it holds comfort through Gorakhpur’s humid monsoon spells, when a stand-alone evaporative unit would drift to 28–30°C.
D-Series works well for stores, laundry, staff and back-of-house zones, and is unbeatable on running cost through the dry, pre-monsoon heat of April–June.
OT, ICU and isolation areas still need dedicated medical-grade AC — these AHUs are for common and support areas, not critical care.
Either series solves the kitchen-and-crowd smell problem — 100% fresh air with no recirculation clears cooking odour from restaurants and banquet halls far better than recirculating split ACs.
DX-Series is the safer pick for guest-facing halls that must hold comfort through humid banquet season (Sept–Nov weddings); D-Series is the low-cost choice for the dry-season crowd.
D-Series suits classrooms and corridors well — lowest running cost (as low as ~20% of conventional AC), 100% fresh filtered air for growing lungs, and near-zero maintenance for institutional budgets.
Where the budget allows, DX-Series extends full comfort through the humid months too — useful for exam halls and admin blocks used year-round.
Specifications summarised from Degree Day’s published D-Series and DX-Series literature. Final unit sizing, static pressure and layout are engineered to your site after a free survey.
An Air Handling Unit (AHU) conditions and circulates large volumes of air through ducting, rather than cooling one room at a time. It's the standard choice for banquet halls, marriage lawns, auditoriums and hospital OPDs — any single open space too large or too tall for split/VRF indoor units to cool evenly.
Yes — our D-Series and DX-Series both run on 100% fresh air, which matters for hospital OPDs and wards where recirculated air is a hygiene concern. Which series fits depends on the space's size, ceiling height and whether you need humidity control; that's confirmed on a site visit.
Both series can work for banquet halls; the choice comes down to hall size, ceiling height and how many hours a day it runs at full occupancy. We compare D-Series and DX-Series against your actual hall dimensions rather than recommending one series across the board.
For a single large open space, an AHU is usually cheaper to run than covering the same area with many split units, since it moves conditioned air through ducting instead of running several separate compressors. We give you a running-cost estimate alongside the equipment quote.