Reverse-Cycle Heat­ing & Cool­ing + Solar + Bat­tery: What Actu­al­ly Pays for Itself

Does a Reverse-Cycle Sys­tem Actu­al­ly Pay for Itself?

Yes, and against gas duct­ed heat­ing specif­i­cal­ly, it’s one of the clear­est wins in home electrification.

A reverse-cycle sys­tem does­n’t gen­er­ate heat, it moves it, which is why it can pro­duce 3 to 6 units of heat­ing or cool­ing for every 1 unit of elec­tric­i­ty it con­sumes. That effi­cien­cy, com­bined with gas prices that have risen more than 40% since 2019, means the run­ning cost gap between gas duct­ed heat­ing and a mod­ern reverse-cycle sys­tem has widened sub­stan­tial­ly in the last few years, not nar­rowed. It also does dou­ble duty: one sys­tem replaces both your gas heater and a sep­a­rate cool­ing unit, which is worth fac­tor­ing in if you’re cur­rent­ly run­ning two sys­tems rather than one.

How Big Is the Rebate, and Who Qualifies?

Big­ger than almost any oth­er sin­gle home elec­tri­fi­ca­tion rebate avail­able in Vic­to­ria, and open to every house­hold regard­less of income.

Under the VEU pro­gram, replac­ing a whole-home duct­ed gas heater with an effi­cient reverse-cycle sys­tem attracts a dis­count of up to $5,530, with no income test, no min­i­mum sys­tem size require­ment, and it applies to rental prop­er­ties as well as own­er-occu­pied homes. Replac­ing a non-duct­ed gas space heater with a reverse-cycle split sys­tem attracts a small­er but still mean­ing­ful dis­count of up to $1,610. Unlike the Solar Homes hot water rebate, there’s no $150,000 house­hold income cap to wor­ry about here at all, this one’s avail­able to every­one, which makes it worth check­ing even if you’ve already been told you don’t qual­i­fy for oth­er rebates this year. See our rebates and incen­tives page for the full cur­rent break­down across solar, bat­tery, hot water, and heat­ing and cooling.

What’s the Real Run­ning Cost Difference?

Mean­ing­ful, and it com­pounds every win­ter you keep the old sys­tem running.

Heat­ing, ven­ti­la­tion and cool­ing typ­i­cal­ly make up around 59% of total ener­gy use in a Vic­to­ri­an home, and the aver­age house­hold spends rough­ly $800 a year on space heat­ing alone, close to a third of the total ener­gy bill. The Vic­to­ri­an Gov­ern­men­t’s own fig­ures put com­bined bill sav­ings at up to $1,140 a year when a duct­ed gas heater is replaced with an effi­cient reverse-cycle sys­tem, and that’s before account­ing for the fixed dai­ly gas sup­ply charge, worth a fur­ther $350 to $400 a year, which dis­ap­pears if the heater was your last gas appliance.

Where Does Solar Fit In?

Less clean­ly than it does for hot water, and it’s worth being upfront about that.

A hot water tank can wait until mid­day to run. A cold house at 7am in July can’t. Heat­ing demand in Mel­bourne win­ters peaks in the ear­ly morn­ing and evening, exact­ly the hours your pan­els are pro­duc­ing the least, which means a big­ger share of your heat­ing load will draw from the grid than was the case in our hot water piece. Cool­ing load in sum­mer is a bet­ter match, since peak air-con­di­tion­er use in the after­noon over­laps well with peak solar gen­er­a­tion, the same self-con­sump­tion win­dow behind Vic­to­ri­a’s Mid­day Pow­er Saver scheme. If you’re weigh­ing up a sys­tem to cov­er both sea­sons, our how solar works guide cov­ers the basics of gen­er­a­tion tim­ing that this depends on, and our prod­uct range shows the solar and bat­tery sys­tems we cur­rent­ly install along­side reverse-cycle heat­ing and cooling.

Where Does the Bat­tery Fit In?

More than for any oth­er appli­ance we’ve cov­ered in this series so far.

Because heat­ing demand is con­cen­trat­ed out­side solar hours, a bat­tery is what actu­al­ly lets a reverse-cycle sys­tem run on stored day­time solar rather than grid pow­er dur­ing a cold morn­ing or evening. This is the appli­ance where the bat­tery siz­ing guide prin­ci­ple of siz­ing against actu­al com­bined load, not a gener­ic esti­mate, mat­ters most, since a house­hold’s win­ter heat­ing draw can be one of the largest sin­gle loads a bat­tery is asked to cov­er, in a way hot water and EV charg­ing typ­i­cal­ly aren’t with­in the same week.

Duct­ed vs Split: Which Rebate Path Fits Your Home?

Dif­fer­ent homes suit dif­fer­ent sys­tems, and the rebate struc­ture reflects that.

A whole-home duct­ed replace­ment makes sense if you’re already run­ning duct­ed gas heat­ing and want a sin­gle sys­tem cov­er­ing the whole house, and it’s where the larg­er $5,530 dis­count applies. A mul­ti-head or sin­gle split sys­tem suits homes with­out exist­ing duct­work, ter­races and town­hous­es com­mon across inner Mel­bourne, or house­holds want­i­ng room-by-room con­trol rather than whole-home heat­ing and cool­ing run­ning togeth­er. Both paths qual­i­fy under VEU. Which one makes finan­cial sense depends on your home­’s lay­out, and it’s worth get­ting a prop­er assess­ment rather than assum­ing the big­ger rebate is auto­mat­i­cal­ly the bet­ter out­come for your spe­cif­ic house.

Is This Actu­al­ly Becom­ing Manda­to­ry Soon?

For gas hot water, yes, from 1 March 2027. For space heat­ing, not cur­rent­ly, and it’s worth being clear about that distinction.

Vic­to­ri­a’s Gas Sub­sti­tu­tion Roadmap explic­it­ly states there’s no change to exist­ing gas cook­ing or space heat­ing appli­ances in exist­ing res­i­den­tial build­ings, that man­date applies to hot water only. What has changed is the direc­tion: no new gas con­nec­tions for new homes since 2024, all new homes required to be all-elec­tric from 2027, and gas prices that have already climbed over 40% since 2019 with fur­ther pres­sure expect­ed as the net­work shrinks. Nobody’s forc­ing your gas heater out ear­ly. But the rebate, the run­ning-cost gap, and the pol­i­cy direc­tion all point the same way, and act­ing on your own time­line, rather than a dead­line you don’t cur­rent­ly have, is exact­ly when you get to choose the sys­tem, the installer, and the price.

Does the Installer Mat­ter Here Too?

Just as much as for a heat pump, and for a duct­ed sys­tem, arguably more.

A reverse-cycle sys­tem’s real-world per­for­mance depends on cor­rect siz­ing for your home­’s floor area and insu­la­tion, and on duct­work that’s prop­er­ly sealed and bal­anced, not just the unit itself. An under­sized or poor­ly duct­ed sys­tem will run con­stant­ly with­out ever quite reach­ing tem­per­a­ture, which erodes the effi­cien­cy gains you’re pay­ing for. As with heat pump hot water, the VEU dis­count can only be claimed through an accred­it­ed provider installing an approved prod­uct, so it’s worth con­firm­ing that upfront rather than after the invoice arrives. If you’d rather talk through duct­ed ver­sus split for your spe­cif­ic home before decid­ing any­thing, our con­tact page has our direct line.

FAQ

Is there an income lim­it for the heat­ing and cool­ing rebate?

No. Unlike the Solar Homes hot water rebate, the VEU heat­ing and cool­ing dis­count has no house­hold income test and applies to both own­er-occu­pied and rental properties.

Do I need solar and a bat­tery to make a reverse-cycle sys­tem worth it?

No. The run­ning-cost gap between gas duct­ed heat­ing and a reverse-cycle sys­tem is sig­nif­i­cant on grid pow­er alone. Solar and bat­tery stor­age improve the run­ning cost fur­ther, par­tic­u­lar­ly for morn­ing and evening heat­ing load, but aren’t a require­ment to see gen­uine savings.

Am I required to replace my gas heater by a cer­tain date?

Not cur­rent­ly. Vic­to­ri­a’s manda­to­ry replace­ment rule applies to gas hot water sys­tems from 1 March 2027. There is no equiv­a­lent fixed dead­line for exist­ing gas space heat­ing at this time.

Is a duct­ed sys­tem always bet­ter than a split system?

Not nec­es­sar­i­ly. Duct­ed sys­tems suit homes already set up for whole-house heat­ing and attract the larg­er rebate, but split sys­tems can be a bet­ter fit for homes with­out duct­work or for house­holds who want zoned, room-by-room control.

What hap­pens to my gas con­nec­tion if I replace my heater but keep gas cooking?

You’ll keep pay­ing the dai­ly gas sup­ply charge as long as any gas appli­ance remains con­nect­ed. The sup­ply charge sav­ing only applies once every gas appli­ance, includ­ing cook­ing, is removed.

How Sun­rise Inno­va­tions Approach­es This

We’re a Clean Ener­gy Coun­cil accred­it­ed, New Ener­gy Tech Approved Sell­er, and an approved AlphaESS installer, recog­nised as a Top 20 Bat­tery Installer in Vic­to­ria. Our installers are in-house rather than sub­con­tract­ed out for one-off jobs. When we scope a reverse-cycle sys­tem along­side solar and bat­tery, we size against your home­’s actu­al heat­ing and cool­ing load, not a gener­ic per-square-metre esti­mate, and account for the fact that this load, unlike hot water, is weight­ed toward hours your pan­els aren’t pro­duc­ing, which changes how we size the bat­tery that sits along­side it.

See our res­i­den­tial solar page for how we approach a full home sys­tem, cal­cu­late your own poten­tial sav­ings, or get a tai­lored quote that accounts for heat­ing and cool­ing along­side your solar and bat­tery setup.

Please Note: Rebate val­ues and run­ning cost fig­ures in this arti­cle are cur­rent as of pub­li­ca­tion and are pro­vid­ed as gen­er­al guid­ance only. VEU dis­counts vary with cer­tifi­cate mar­ket pric­ing, your spe­cif­ic sys­tem, and eli­gi­bil­i­ty at time of instal­la­tion. For an exact fig­ure for your home, get a tai­lored quote rather than rely­ing on the esti­mates above.