Heating and cooling older Ballarat homes.
A new machine cannot correct every draught, empty ceiling or leaking duct. Use the right upgrade order to buy smaller equipment, get steadier rooms and avoid damaging period features.
Improve the shell, then size the system.
Ballarat’s established suburbs contain weatherboards, solid-brick homes, miners’ cottages and later brick veneer. Common features include high ceilings, single glazing, suspended timber floors and extensions built to several different standards. On a cold windy night, uncontrolled air leakage can dominate the heat load. Installing a larger heater first can create hot central rooms, cold edges and higher bills without fixing comfort.
The useful order is: repair water entry, assess hazardous materials, seal major uncontrolled gaps, bring ceiling insulation up to a sensible level, address accessible underfloor gaps, decide which rooms will be conditioned, then calculate room-by-room heating and cooling loads. Final equipment selection comes after those decisions. If insulation is planned but not yet fitted, the designer should model the completed condition and make that assumption explicit.
For a typical 120m² to 180m² home, ceiling insulation removal and replacement might cost $2,500 to $5,500, depending on access and contamination. Targeted weather sealing is often $600 to $2,500. Underfloor insulation can cost $35 to $70 per m² where access is workable. These are separate specialist scopes, but they may prevent spending another $2,000 to $4,000 on the next HVAC capacity step.
Gas replacement, reverse cycle or room-by-room?
Replace ducted gas when the house already has sound, correctly sized ducts, the household values rapid whole-home heat and retaining gas is a deliberate choice. A unit-only style replacement with genuinely reusable ducts may cost $8,500 to $14,000. A full new system is more often $10,000 to $18,000. Read the ducted gas heating details and insist on a new heat-load check rather than copying the old nameplate.
Choose ducted reverse cycle when one system should heat and cool, the envelope can be improved, solar is available or planned, and there is room for insulated ducts. An older Ballarat house commonly lands at $18,000 to $30,000 because electrical, access and duct requirements are less predictable. Cold-climate heating performance matters more than the headline cooling capacity.
Choose several split systems when only 2 to 4 rooms need regular conditioning, a heritage ceiling should stay untouched or there is no usable roof cavity. A quality installed split commonly costs $2,800 to $5,500 per room depending on size, electrical work and pipe route. It can be cheaper and more efficient than forcing whole-home ductwork into a building that resists it, although multiple outdoor units need careful siting.
The full decision is explored in the gas versus reverse-cycle guide. There is no responsible default for every period home. The recommendation should follow the rooms used, envelope, tariffs, gas connection, solar and acceptable exterior changes.
Inspect before promising to reuse ducts.
Old floor and ceiling outlets reveal almost nothing about the concealed duct. Flexible ducts older than 15 to 20 years may have failed outer insulation, torn inner liners, crushed sections, broken hanging straps or rodent damage. Sheet-metal ducts can leak at unsealed joints. A branch may look connected at the grille while losing a large share of its air before it reaches the room.
Allow $3,500 to $7,500 for a complete 8 to 12 outlet re-duct in an accessible single-storey home. Difficult subfloor or roof access can push it higher. Reuse is reasonable only when an inspection records sizes, condition, support, insulation and airtight connections, followed by an airflow balance. Refrigerated cooling also needs duct insulation and vapour control suitable for cold supply air, otherwise condensation can wet the roof space.
Older linings, switchboards and service enclosures also need care. Suspected asbestos-containing material must be assessed before drilling or removal, not discovered with a holesaw. Old ceramic fuses, limited mains capacity or no spare ways can add $1,500 to $6,000 to a reverse-cycle project after electrical assessment. Keep a contingency of 10 percent to 15 percent for concealed conditions, but require approval before it is used.
External equipment needs a considered location.
A domestic air conditioner often does not require a planning permit, but Ballarat has extensive heritage overlays. A visible outdoor unit, new roof penetration, external duct enclosure or screen can affect a heritage place differently from a concealed rear installation. Obtain written City of Ballarat advice before work on a heritage-overlay property. Allow at least 2 to 6 weeks in the program if a planning review may be necessary, and do not order equipment on the assumption that the preferred location will be accepted.
Gas installation work must be performed by an appropriately licensed gasfitter and follow AS/NZS 5601.1. Air-conditioning plumbing work valued at $750 or more requires a Victorian plumbing compliance certificate. Fixed electrical work needs a licensed electrician and certificate of electrical safety. Refrigerant handling requires the relevant ARCtick licence. Ask for practitioner details and every certificate in the quote, then keep them with the property records.
Outdoor units also need service clearance, drainage and a location that manages noise for bedrooms and neighbours. Concealing the unit inside an unventilated screen can destroy airflow and efficiency. For choosing and checking a contractor, use the installer checklist and the Victorian gas compliance guide.
Use the scheme before work starts, not after.
Victorian Energy Upgrades discounts apply to approved high-efficiency reverse-cycle systems through accredited providers. In 2026, published indicative discounts reach up to $5,530 when an eligible ducted gas heater is replaced by an approved 22.4 kW ducted reverse-cycle system. Smaller capacities and different old appliances attract lower amounts. The old equipment, new model and provider pathway must be confirmed before installation begins.
Weather sealing and glazing activities can also attract VEU support when the products and provider meet current rules. The Victorian Government has announced household insulation discounts of up to $1,482 from 1 October 2026. Scheme values and approved products can change, so show the gross project price, confirmed discount and final payable amount separately. Never compare one quote before discount with another after discount.
Start planning in September to November for envelope work, then finalise HVAC design through February to April. That gives insulation trades time before the winter rush and lets heating be commissioned before sustained cold weather. If the old gas heater has soot, delayed ignition, gas odour or carbon monoxide concerns, safety overrides the ideal schedule. Stop using it and arrange qualified assessment. Our Ballarat timing guide covers lead times in more detail.
Plan the house and system as one job.
Get the envelope assumptions, room loads, duct condition, equipment scope and certificates written down before comparing prices.