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AirGreen × ACD · 4 zones
Four rooms on several floors, one MPD outdoor unit
Sold and installed by AirGreen. Montréal, Laval, Longueuil, the South Shore and the North Shore.
ACD · MPD multi-zone · 4 heads
Three MPD outdoor units take four heads: the MPD 30,000, 36,000 and 42,000. Between two heads, ACD publishes 7.5 m of height at most. Place your four heads, floor by floor, then the outdoor unit: the tool compares the gaps with the published limits.
Updated November 5, 2026 · ACD MPD sheets and manual, AHRI certificates
ACD MPD-22 and English multi-zone sheets
Four-head combinations published, outdoor unit by outdoor unit
Combinations printed in both ACD sheets. The English sheet adds 09 + 09 + 09 + 18 for the MPD 30,000.
This page answers
Four ACD heads on two floors: does the height work?
On this page
The ACD shop · 4 zones
Three outdoor units, the MPD 30,000, 36,000 and 42,000, each sold with four heads. Price on quotation.
01 · Two floors, four heads
Pick the floor of each head, the place of the outdoor unit and your storey height. The cross-section shows where the heads are; the two bars compare the gaps with the published limits.
The floor of each head and the place of the outdoor unit
Head 1
Head 2
Head 3
Head 4
Outdoor unit
Limits: MPD-22 sheet and MPD manual (INS527), p. 14, the same for the MPD 30,000, 36,000 and 42,000: 7.5 m between two heads, 15 m between the outdoor unit and a head. Floor-by-floor count: one storey height per level, heads and outdoor unit counted at the floor of their level; the roof counts as one level above the attic. The real mounting height of the wall heads and of the outdoor unit is measured on site.
Your four heads, floor by floor
Between heads2.7 m of the 7.5 m published
Outdoor unit to a head2.7 m of the 15 m published
✓The four heads spread over 2.7 m (published limit: 7.5 m between two heads) and the head farthest in height from the outdoor unit is 2.7 m away (published limit: 15 m): by this floor-by-floor count, the layout stays within the published limits of the MPD 30,000, 36,000 and 42,000.
In the shop: MPD 30,000, 4 headsMPD 36,000, 4 headsMPD 42,000, 4 heads
02 · 4 heads or 5 heads
Same outdoor unit, same height limits: the fifth head shortens the list of combinations.
4 heads · MPD-22 sheet
5 heads · MPD-22 sheet
On the same MPD 42,000, which has no published AHRI certificate, the fifth head takes the list from 16 to 12 combinations, and only one keeps a 24,000 head.
03 · Did you know
7.5 m
ACD publishes 7.5 m of height at most between two heads for the MPD 30,000, 36,000 and 42,000, against 10 m for the MPD 18,000 and 24,000.
ACD MPD-22 sheet, p. 2; MPD manual (INS527), p. 1409 + 18 + 18 + 18
With four heads, the only published combination with three 18,000 heads is 09 + 18 + 18 + 18, on the MPD 42,000. The MPD 36,000 stops at two 18,000 heads (09 + 09 + 18 + 18), and the MPD 30,000 at 12,000 heads.
ACD MPD-22 sheet, p. 4; English ACD multi-zone sheet16
With four heads, the MPD-22 sheet gives the MPD 42,000 16 combinations, against 10 for the MPD 36,000 and 3 for the MPD 30,000.
ACD MPD-22 sheet, p. 4; English ACD multi-zone sheet04 · Questions
The MPD 30,000 is the smallest four-port MPD outdoor unit. The MPD-22 sheet gives it only three four-head combinations, all with 9,000 and 12,000 heads: 09 + 09 + 09 + 09, 09 + 09 + 09 + 12 and 09 + 09 + 12 + 12. For an 18,000 or 24,000 head, you need an MPD 36,000 or 42,000.
ACD MPD-22 sheet, p. 4; English ACD multi-zone sheetIn a house with a basement, a ground floor, an upper floor and an attic, the attic head is three storey heights above the basement head: at 2.5 m per storey, that makes 7.5 m, the limit published between two heads on the MPD 30,000 to 42,000. By this floor-by-floor count, above 2.5 m per storey the layout goes past the limit; the real height difference between the two heads is measured on site.
ACD MPD-22 sheet, p. 2; MPD manual (INS527), p. 14For the MPD 36,000, ACD lists only one four-head combination with a 24,000 head: 09 + 09 + 09 + 24. The MPD 42,000 has three: 09 + 09 + 09 + 24, 09 + 12 + 12 + 24 and 12 + 12 + 12 + 24. The MPD 30,000 has none.
ACD MPD-22 sheet, p. 4; English ACD multi-zone sheetACD’s sheets publish 15 m of height at most between the outdoor unit and a head for the MPD 30,000, 36,000 and 42,000, twice the 7.5 m published between two heads. On the ground, on a balcony or on the roof: the tool above counts the gap from where the outdoor unit sits, and the location is decided at the on-site assessment, with the line-set route.
ACD MPD-22 sheet, p. 2; MPD manual (INS527), p. 14Per its AHRI certificate 202110500, the MPD 30,000 gives 28,400 BTU/h of cooling and 30,000 BTU/h of heating at 8.3 °C, with a SEER of 21 and an HSPF of 11.5.
AHRI certificate 202110500, issued August 9, 2022Pricing is by quotation, installation included: it depends on the MPD outdoor unit, the floors the four heads go on and the line-set route between them. The home estimate is free and without obligation.
AirGreen · Heating and cooling
We locate the four heads and the outdoor unit, measure the heights and the line-set route, assess your heating needs on site, then send you the quote. The estimate is free.
Price on quotation; free home estimate.