8 Best Places to Buy a System 3 Aircon in Singapore (2026): The Same Mitsubishi Runs $2,890 to $4,349

The **Starmex System 3 (9K x3)** listing is **$3,580 (U.P. $4,199)** and the title says "& FREE INSTALLATION", which on this shop means a **Premium Installation Package for new HDB installs**: 0.5-inch Class "0" K-Flex insulation, **SWG 22 (0.71mm) copper piping**, uPVC 16mm drainage pipe, dismantling and disposal of the old system and a **1-year workmanship warranty**. Its spec block confirms the same hardware everyone else is selling, **outdoor MXY-3H28VG with MSXY-FP10VG x 3**, so this is a like-for-like number. Unusually, the shop prints its whole voucher list on the aircon page itself: **7ST0** takes **$70 off $1,899**, **4ST9** is **$49 off $1,199**, **2ST9** is **$29 off $699** and **0ST5** is **$5 off $499**, all **valid till 30 September 2026**, with **NEWUSER** giving first-time subscribers 1% off. Applying 7ST0 puts this System 3 at **$3,510**, the cheapest fitted price in this guide from a shop that can also take the Climate Voucher. Two things to read before you click: the price covers **standard HDB residential basic installation only** with "the standard piping length given" and the shop does not say what that length is, and it **excludes the stainless-steel bracket and power point**. Condos, landed and commercial addresses cost more. Installation is scheduled **within about a week**, subject to slots, and the checkout asks you to choose **New Installation** (new piping) or **Replacement Installation** (reusing existing piping), and those are two different prices: the replacement variant is **$3,150**, which with 7ST0 lands at **$3,080**. If your existing piping can be reused, that is the lowest fitted number anywhere in this guide from a voucher-approved shop. Its cheapest System 3 overall is the **Alpha+ System 3 WiFi (9K x3) at $3,199**.

The same **Mitsubishi MXY-3H28VG / 3x MSXY-FP10VG** lists at **$4,019 (U.P. $4,420.90)**, which looks like the second-dearest number in this guide until you put it in the cart: the **9.9 Sale** takes **$397.88** off and the total payable becomes **$3,621.12**. That sale runs from **7 September 8.30am to 20 September 11.59pm 2026**, so it is the one deadline in this article that is genuinely close. The free gifts attached are **3 years installation warranty**, a **material upgrade worth $360** and **up to 5 years basic extended warranty**, and the cart also dropped in a free mooncake. What makes Gain City worth reading even if you buy elsewhere is the installation small print, because it is the only retailer here that publishes a piping allowance in feet: **up to 30 ft for a System 1 and 50 ft for multi-split systems**, then **$8 per ft for 9K and 12K**, **$10 per ft for 18K** and **$12 per ft for 24K**. On a three-room HDB run that 50 ft is usually enough, which is not a given elsewhere. Two catches: the **material upgrade is not included on Daikin, Europace and selected models of other brands**, and the installation date is **1 to 4 weeks** after purchase rather than days. Its cheapest System 3 is the **Midea MEZ-3M28E with three 9,000 BTU heads at $3,449**. The online cart carries a **Climate Voucher field capped at $400**, with the condition that vouchers **from only one address** can be applied per transaction, and Gain City has **12 stores approved for air-conditioners**. Plan around the deadline rather than the price: when the 9.9 Sale closes the cart discount goes with it and this set reverts to **$4,019**, which moves Gain City from second-cheapest to above COURTS. Its listing is also the only one that publishes the running cost, **2,418 kWh and about $653 of electricity a year**.

COURTS lists the benchmark Mitsubishi as **$3,674 (RRP $4,189, save 12%)** with a **free aircon site survey** and a note that the item is **on an indent basis**, so the delivery date moves with the product lead time. Its System 3 category runs to **91 products**. It also has **13 stores approved for air-conditioners** on the Climate Voucher map, more than any other chain that actually stocks split systems. The trap is the banner at the top of every COURTS page. The **Mid-Autumn Sale**, up to **$129 off with a minimum spend of $99** on code **MID26**, runs **14 to 27 September 2026** and is **limited to the first 250 redemptions**, and its exclusion list names **Aircons** outright. So does **GET**, the sitewide ladder that pays $50 off $799 up to $300 off $2,999. In other words the two codes most likely to catch your eye on a $3,674 basket do not work on it. The other gap is what the price covers. Neither the product page nor the COURTS aircon buying guide states an installation charge or a piping allowance, and the only add-ons offered at checkout are **aircon cleaning ($105 to $300)** and disposal of the old item, so the scope of the work is something you learn at the site survey rather than before you pay.

Audio House sells **243 aircon listings including 80 System 3 sets**, every one of them labelled with its energy rating, and the benchmark **MIT. ELECTRIC SYS3 INVERTER MXY-3H28VG + MSXY-FP10VG-SG3 x3** is **$2,890 (U.P. $3,499)**. That is **$690 under Mega Discount Store and $1,459 under Best Denki** on identical model codes, and it is the reason this shop keeps showing up in price threads. Open the product page and the picture changes. Installation is a dropdown, not a given: **HDB Installation With Upgrade Material is $900**, delivery is **$40**, and self-collection is only offered after three working days. Take the installation and the real number is **$3,830**, the dearest way to get this system into a flat out of the five retailers here. Two things still recommend it. Members earn **eCashback**, and on this listing that is **an extra $560**, valid for ten years across the website and showroom. And every eligible listing carries the line **"This item is eligible for Climate Vouchers at our showroom"**, which is a clearer per-item answer than most shops give, even if it also tells you the voucher cannot be used online. Audio House has **one approved location** on the Climate Voucher map, so the $400 is a trip, not a checkbox.

The benchmark set is **$4,349** here, **$769 above Mega Discount Store** for the same two model codes, and the product page prints its **COR number MELS-MIT-AC190018** and **5 TICKS** beside it, which no other retailer in this guide does. What you get for the premium is the most honest installation paragraph online: **free standard non-concealed installation including 25 ft of piping and trunking**, anything beyond charged at **$8 per ft**, **excluding the stainless steel bracket and power point**, with **additional charges for private properties** and free dismantling of the old unit. **Express Installation within 3 working days** is offered subject to conditions and stock. Its cheapest System 3 is the **LG Tri Con Z3UQ26GFA0 at $3,629**, and its **Aircon Discount Carnival** banner advertises **up to 70% off**, an **extra up to $388 off with promo code BESTAIRCON** on eligible aircons, and tells you outright to stack your **$400 Climate Vouchers** on top. Two notes of caution. The carnival banner carries **no end date**, and its filename still says July, so treat it as a standing campaign rather than a deadline. And extended warranty is sold hard at checkout: on this model the 5-year non-member options run **$826.31 and $695.84**. Best Denki has **12 stores approved for air-conditioners**.

Run by **Techmen Engineering Pte Ltd (UEN 202347905M)**, this is a supply-and-install specialist rather than a shop, and it publishes its floor prices in plain language: **System 3 from S$2,980 fully installed**, with **Panasonic from $3,080**, **Mitsubishi Electric from $3,280** and **Daikin from $3,320**. The reason to read it even if you buy from a chain is the inclusion list, which is the most specific of any operator here: Armaflex closed-cell insulation, **304 stainless steel wall brackets**, PVC trunking, electrical wiring and connections, commissioning and testing, and disposal of old units where applicable, with a **3-year workmanship warranty**. Get the copper allowance in writing, because on **19 September 2026** its Mitsubishi page carried two different figures at once: the inclusion list says **up to 15 metres per indoor unit**, with anything past 15 metres quoted separately, while the FAQ block further down the same page still says **8 metres**, and the page quotes **22 gauge** in one list and **21 gauge** in another. Note what that bracket means in a comparison: **Best Denki and Mega Discount Store both exclude it**, so their headline is missing a part this one includes. Even on the lower of its two figures, 8 metres per indoor unit is about **79 ft of copper across three heads against Gain City's 50 ft for the whole system**. The brand grid is worth a second look too, because the **Midea System 3 is listed from $2,880**, below the **$2,980** floor the same page's FAQ gives for a System 3, alongside **Toshiba from $3,180**. The catch is the one that decides most HDB purchases. This company is **not on the Climate Voucher participating-retailer map**, so the $400 that a 5-tick system earns you at COURTS or Gain City is simply not available here, and $2,980 against $3,510 at Mega Discount Store is a $530 gap that a voucher more than erases.

Silverback publishes a straight ladder on its promotion page: **System 1 from $950, System 2 from $1,599, System 3 from $1,799 and System 4 from $2,499**, all stated to come with installation. On its System 3 page the named picks are a **Midea multi-split (MAE-3M21D) at $1,899**, which it calls the cheapest System 3 it sells and about **$700 under the Mitsubishi**, a **Mitsubishi Starmex System 3 at $2,999**, and a **Midea All Easy Pro Premium 5-tick at $2,599**. Materials are listed too: **half-inch Armaflex, SWG22 copper pipe, Keystone cables and 16mm water pipe**. Free site visits, and the company answers on **9651 5152**. Read the tick ratings before the prices. The **$1,899 Midea is a 4-tick machine**, and the official Climate Voucher page for air-conditioners, last updated 18 June 2026, says the label to look for is **5 ticks**, so that unit earns nothing. Silverback is also **not a participating retailer** for the vouchers, so even its 5-tick All Easy Pro does not unlock the $400. Against Mega Discount Store's $3,510 for a 5-tick Starmex that does, its **$2,999 Starmex** is a genuine saving and its **$1,899 Midea** is a different, cheaper class of machine rather than the same thing for less. Parts of the page still reference 2020 and 2022, so confirm the exact model and BTU split in writing before you commit.

Registered as **ALL-IN-ONE FIX & MOVE (UEN 53505530K)**, FixMove publishes two separate ladders, and the first one is the useful oddity in this guide. **Install-only starts at S$1,200 for a System 3** and **S$1,600 for a System 4**, where you supply the indoor and outdoor units and the quote covers total pipe run, trunking, drainage, access, bracket, removal of the old unit and testing. Its **supply-and-install** range is **S$2,200 to S$2,600 for a System 3** and **S$2,800 to S$3,400 for a System 4**, with **System 1 at S$850** for 9,000 BTU. The install-only ladder starts lower than the System 3 line suggests, at **S$450 for a System 1** and **S$850 for a System 2**. A **S$10 fuel surcharge applies to every visit**, there is no separate call-out or inspection fee, and asking for urgent service or a specific appointment time adds **S$30**. The install-only line matters because of how the Climate Voucher works: the voucher is spent on the appliance at an approved shop, so buying a 5-tick set where the $400 is accepted and then paying an installer separately is a legitimate route, and it is the only way to combine a chain's voucher with an installer's piping terms. FixMove is careful to call its figures **planning ranges rather than fixed package promises**, and says a quote should be compared only once the exact indoor and outdoor models, included pipe length, trunking, bracket, electrical scope, access, removal, commissioning, exclusions and warranty are written down. That is the right checklist for every operator on this page.