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AirGreen × ACD · 2 zones
Two rooms on one MPD outdoor unit, and maybe a third
Sold and installed by AirGreen. Montréal, Laval, Longueuil, the South Shore and the North Shore.
ACD · MPD multi-zone · 2 heads
For two rooms, the shop carries all five ACD MPD outdoor units, from the 2-port MPD 18,000 to the 5-port MPD 42,000. Pick the size of the two heads: the tool reads ACD’s combination table for each one and shows you which keeps a port for a third room.
Updated November 5, 2026 · ACD MPD sheets and manual, AHRI certificates
ACD MPD-22 and English multi-zone sheets
Head pairs published, outdoor unit by outdoor unit
Pairs printed in both ACD sheets. The English sheet adds 12 + 12 for the MPD 18,000.
This page answers
For two rooms, take the small 2-port ACD outdoor unit or a bigger one?
On this page
The ACD shop · 2 zones
Five outdoor units, from the MPD 18,000 to the MPD 42,000, each sold with two heads. Price on quotation.
01 · Add a room later?
Pick the size of the two heads. Each row says whether ACD lists the pair for that outdoor unit, how many ports it keeps free and which third head its table would take.
My two rooms
Head 1 (BTU)
Head 2 (BTU)
A third room later?
Combinations: ACD’s table, pairs and trios printed in both the MPD-22 sheet and the English multi-zone sheet. The table reads by size: a 09 + 12 pair stands for one 9,000 and one 12,000 BTU/h head, whatever their type. Line set: MPD-22 sheet and MPD manual (INS527), p. 14. Heating: AHRI certificates of August 9, 2022, at 8.3 °C; for the MPD 42,000, the nominal value of the MPD-22 sheet, with no test temperature printed (the same sheet gives 42,500 BTU/h for the MPD 36,000).
The five outdoor units for this pair
| Outdoor unit | Pair published | Ports left | Line set | Heating at 8.3 °C |
|---|---|---|---|---|
| MPD 18,000MPD18KCH22S-OProduct page | yes | 0 | 20 m in total10 m max. per line | 19,000 BTU/hAHRI certificate 202110494 |
| MPD 24,000MPD24KCH21S-OProduct page | yes | 1 | 60 m in total20 m max. per line | 26,000 BTU/hAHRI certificate 202110497 |
| MPD 30,000MPD30KCH21S-OProduct page | yes | 2 | 70 m in total25 m max. per line | 30,000 BTU/hAHRI certificate 202110500 |
| MPD 36,000MPD36KCH21S-OProduct page | yes | 3 | 75 m in total25 m max. per line | 36,000 BTU/hAHRI certificate 202110503 |
| MPD 42,000MPD42KCH21S-OProduct page | yes | 3 | 75 m in total25 m max. per line | 45,000 BTU/hnominal per the MPD-22 sheet, no certificate |
✓09 + 12: the MPD 18,000 is the smallest outdoor unit ACD lists this pair for. It uses both of its ports, with 20 m of line set in total and 10 m max. per line.
A free port is not enough: the third head must form, with the first two, a trio from ACD’s table. Pick “Maybe”: the tool shows the third head each outdoor unit would take; the 3-zone page lists every trio.
02 · Two or three heads
Same outdoor unit, same AHRI certificate 202110497: only the list of combinations changes.
2 heads · AHRI certificate 202110497
3 heads · AHRI certificate 202110497
With two heads, ACD lists six pairs for the MPD 24,000, from 09 + 09 to 18 + 18, and one port stays free. With three heads, the list has five trios, and the only 18,000 head published is in 09 + 09 + 18. Either way, each line can run 20 m at most, for 60 m of line set in total.
03 · Did you know
2 pairs
The MPD-22 sheet gives 09 + 09 and 09 + 12 for the MPD 18,000. ACD’s English sheet adds 12 + 12: the two documents disagree, and we keep to the pairs both of them print.
ACD MPD-22 sheet, p. 4; English ACD multi-zone sheet10 m
The MPD 18,000 takes 20 m of line set in total, 10 m max. per line and 10 m of height, from the outdoor unit to a head as between the two heads: the shortest budget of the five MPD outdoor units.
ACD MPD-22 sheet, p. 2; MPD manual (INS527), p. 146 = 6
Both ACD sheets give the MPD 30,000 exactly the six pairs of the MPD 24,000, from 09 + 09 to 18 + 18; likewise, the MPD 42,000 has the same ten pairs as the MPD 36,000. With two heads, the list only grows from the MPD 18,000 to the MPD 24,000, then from the MPD 30,000 to the MPD 36,000.
ACD MPD-22 sheet, p. 4; English ACD multi-zone sheet04 · Questions
The MPD 18,000 is the only two-port MPD outdoor unit; it has only two published pairs, 09 + 09 and 09 + 12. For two bigger heads, or to keep a port free, you need an MPD 24,000 or larger: the MPD 24,000 and 30,000 have six published pairs, up to 18 + 18; the MPD 36,000 and 42,000 have ten, up to 24 + 24. The size is decided at the on-site assessment of your heating needs.
ACD MPD-22 and English multi-zone sheetsThe ACD MPD-22 sheet does not list 12 + 12 for the MPD 18,000; ACD’s English sheet does. The two documents disagree. We keep to the pairs both sheets print: for 12 + 12, that is the MPD 24,000 or larger.
ACD MPD-22 sheet, p. 4; English ACD multi-zone sheetTwo heads in 09 + 09 or 09 + 12: OCD wall head, CMD console, SMD ducted unit or FCD floor-ceiling unit. The CCD cassette starts at 12,000: it only fits as the 12,000 head in 09 + 12.
ACD MPD-22 sheet, p. 3 and 4On ACD’s sheets, you need a free port and a published trio that contains your first two heads. The MPD 18,000 has no third port; the MPD 24,000 to 42,000 have at least one. The tool above shows, for your pair, which third head each outdoor unit would take; the addition itself is planned at the on-site assessment.
ACD MPD-22 and English multi-zone sheetsYes, a little: per its AHRI certificate 202110494, the MPD 18,000 gives 19,000 BTU/h of heating at 8.3 °C for 18,000 BTU/h of cooling, with a SEER of 22 and an HSPF of 11.
AHRI certificate 202110494, issued August 9, 2022Pricing is by quotation, installation included: it depends on the MPD outdoor unit, the two heads, whether a port is kept free for later and the line-set route. The home estimate is free and without obligation.
AirGreen · Heating and cooling
We look at the two rooms, the line-set route and the room for a third head, assess your heating needs on site, then send you the quote. The estimate is free.
Price on quotation; free home estimate.