Cottage rooms and warehouse volumes in the same street
Split System Installation in Spotswood
Spotswood is small but unusual. Half of it is period cottages on compact blocks near Hudsons Road. The other half is converted industrial: studios, warehouse conversions and workshop buildings around Scienceworks and the Pumping Station, with volumes no residential sizing chart was ever written for.
- Spotswood 3015
- Jemena network
- REC 37223
The short answer
Split system air conditioning in Spotswood costs $2,500 to $7,500 installed. Spotswood is unusual because a small period cottage and a converted warehouse with an uninsulated steel deck roof can sit on the same street, and their capacity requirements differ by a factor of three. Bay and bridge exposure means corrosion rated condenser coils and stainless brackets throughout the suburb. Reverse cycle heats a room for roughly 28 to 36 cents an hour against 50 to 72 cents for ducted gas.

From one of our jobs
Outdoor units set on level mounts, clear of the fence line
Photographed on site in Melbourne’s west. REC 37223.
The two need completely different systems, and the mistake we most often correct here is a warehouse conversion fitted with a unit sized as if it were a large living room. It never gets there, it runs flat out all summer, and it wears out early.
Warehouse conversions are a volume problem
A converted industrial space can have a five metre ceiling, an exposed steel deck roof with little or no insulation, large single glazed steel framed windows and a concrete slab floor. The volume alone can be three or four times a residential living room, and the envelope offers almost no resistance to heat flow.
Sizing these spaces is a volume and construction calculation, not a floor area one, and the honest answer is often that a single head will not do it. Two heads, or a much larger unit than anyone expected, or insulating the roof first. Where insulation is possible we recommend it before the equipment, because it changes the required capacity dramatically and it improves the space year round.
Ceiling height
Four and five metre ceilings are common in these conversions. Volume, not floor area, drives the capacity.
Steel deck roofs
Uninsulated steel deck radiates heat straight into the space in summer and loses it just as fast in winter.
Air stratification
In a tall space, warm air pools at high level. Head position, fan speed and sometimes a destratification fan matter as much as capacity.
The cottages are the opposite problem
Period cottages around Hudsons Road are compact, with modest room sizes and ceilings around 2.7 to 3.0 metres. They are easy to condition and the capacities are modest, typically 2.5 to 3.5kW for bedrooms and 5.0kW for a living area.
What limits them is outside, not inside. Compact blocks with minimal side access mean one viable condenser position in most cases, which pushes these homes toward a multi head system serving two or three rooms from one outdoor unit. That is fine, provided you understand that all heads share a compressor and a refrigerant circuit and cannot run in different modes.
Bay and bridge exposure
Spotswood sits between the water and the West Gate approach, and outdoor equipment here weathers harder than the distance from the beach suggests. Salt, wind and, on the warehouse conversions, large elevations with no eaves at all to shelter anything mounted on them.
We specify corrosion protected condenser coils and stainless or hot dip galvanised mounting hardware across this suburb rather than only near the foreshore. Where a mounting position offers no shelter, the specification does the work a roof overhang would do elsewhere. An annual fresh water rinse of the outdoor coil is worth more here than almost anywhere except Seaholme.
Cost, licensing and the electrical side
Installed cost is $2,500 to $7,500 depending on capacity and head count, with warehouse conversions frequently at or above the top of that range because of the capacity required and the access involved. Victorian Energy Upgrades discounts are applied to the invoice directly, no income test, property at least two years old, $200 including GST minimum contribution, amounts confirmed at quote because the program changed on 30 September 2026.
Refrigerant work requires an ARC licence and the electrical connection requires a licensed electrician issuing a Certificate of Electrical Safety. Converted buildings here often carry legacy three phase supply, which makes larger equipment practical without a supply upgrade. Cottage boards, by contrast, are frequently original and undersized and need attention before another dedicated circuit goes in.
What should never be optional is the part you cannot see. Brazed joints, a nitrogen pressure test, a proper vacuum on the lines, insulated and UV protected pipework and a graded condensate drain. On an exposed Spotswood elevation the UV protection on the pipe insulation matters more than most places, because unprotected lagging perishes in a couple of summers.
We hold REC 37223 and carry out both the refrigeration and the electrical work ourselves, so the system is commissioned and running before we leave rather than waiting on a second trade. Our workmanship is guaranteed for 12 months on top of the manufacturer equipment warranty.
On the ground
Spotswood specifics
- Converted industrial buildings here have volumes three or four times a residential living room and frequently an uninsulated steel deck roof. Sizing them from floor area is the most common mistake we are called in to fix.
- Legacy three phase supply in converted buildings makes larger equipment practical without a supply upgrade, which is a genuine advantage over the cottages a street away.
- Compact cottage blocks with minimal side access usually leave one viable condenser position, so multi head systems are the norm for the residential half of the suburb.
- Bay and bridge exposure means outdoor gear weathers harder than the distance from the water suggests, and warehouse elevations offer no eaves at all, so hardware specification has to compensate.
Licensed and accredited work by a local team. Read about Pivot Trade Services or see recent jobs across the western suburbs.
Answers
Spotswood questions
Far more than the floor area suggests, and possibly more than one head. These spaces have four or five metre ceilings, exposed steel deck roofs with little insulation and large single glazed windows, so the volume and the envelope both work against you. We calculate from volume and construction. Where insulating the roof is possible, doing that first changes the required capacity dramatically.
Air stratification. In a tall space, warm air rises and pools at high level where nobody benefits from it while the occupied zone stays cool. It is the classic warehouse conversion complaint. Head position and fan speed help, and in the tallest spaces a destratification fan pushing high level air back down makes a bigger difference than extra heating capacity would.
Quite possibly. Buildings that once ran machinery in Spotswood often kept their three phase supply through the conversion. Look for three incoming active conductors and a three pole main switch in the meter box. It does not matter for a domestic split, which runs single phase, but it makes larger ducted or multiple systems practical without a supply upgrade.
A multi head system with one outdoor unit in the rear yard serving two or three indoor heads is the usual answer on a compact Spotswood block. Capacities in these cottages are modest, typically 2.5 to 3.5kW for bedrooms and 5.0kW for a living area. The constraint is entirely about where the condenser can sit with proper airflow and service access.
More than the map suggests. The suburb sits between the water and the West Gate approach, so outdoor equipment takes salt and wind, and the warehouse conversions have large elevations with no eaves to shelter anything mounted on them. We use corrosion protected coils and stainless or galvanised brackets across the suburb, and an annual fresh water rinse genuinely extends coil life here.
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