Central AC vs DIY mini-split

Modern house exterior with an outdoor heat pump / AC unit beside the garage — Photo: alpha innotec / Unsplash

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Last reviewed: October 28, 2026.

Homeowners shopping for cooling usually face two paths: a ducted central air conditioner that cools the whole house through existing ducts, or a ductless mini-split that cools one zone (or a few) without relying on ductwork. This short guide explains the tradeoffs and lists two in-stock HVACDirect picks—one Texas-legal 3-ton Goodman central system and one MRCOOL DIY 12k BTU mini-split.

Central (ducted) AC in plain English

A split central system pairs an outdoor condenser with an indoor air handler (or furnace + coil). Cool air moves through the home’s supply and return ducts. Choose this path when:

You already have usable ductwork in decent shape.
You want one system to cool most or all rooms evenly.
You are replacing a failed condenser/air handler pair and want matched equipment.

Sizing is in tons (1 ton ≈ 12,000 BTU/h). A 3-ton system is a common mid-size pick for roughly 1,600–1,900 sq. ft. in many climates—but insulation, windows, attic heat, and a Manual J load calculation matter more than square footage alone. In southern states including Texas, efficiency rules generally block the lowest SEER2 condensers; shop systems that meet your state’s minimum (often around 14.3 SEER2 for cooling-only equipment—confirm current DOE/state rules before you buy).

Install reality: refrigerant work, electrical, and warranty registration usually require a licensed HVAC contractor. Buying equipment online can still cut equipment cost; labor and permits are separate.

DIY ductless mini-split in plain English

A mini-split puts a wall (or ceiling) air handler in the room you care about and a small outdoor condenser outside. Pre-charged Quick Connect line sets on some DIY brands skip vacuum pumps and refrigerant handling for the homeowner path. Choose this path when:

You need cooling for a garage apartment, addition, home office, or room that ducts never reached well.
Ductwork is missing, leaky, or too expensive to fix for one zone.
You want heating and cooling in one heat-pump package for that zone.

A 12,000 BTU (1-ton) single-zone unit commonly covers about 400–600 sq. ft. under ideal conditions—confirm the maker’s coverage note and your room’s heat gain. Electrical still has to be correct (breaker, disconnect, whip); local codes and HOA rules still apply.

Quick comparison

Coverage: central = whole-house via ducts; mini-split = one zone per indoor head (multi-zone kits exist separately).
Install: central = pro refrigerant/electrical; DIY mini-split = homeowner-friendly line sets on designed kits, still follow the manual and code.
Efficiency: both list SEER2; mini-splits often post higher SEER2 on a single zone; central efficiency depends on the matched condenser + air handler pair.
Filters: central systems still need the panel filter you size in our furnace/AC filter MERV guide; mini-splits use washable indoor filters—clean them on the maker’s schedule.

Curated HVACDirect picks (2)

Two products only—max affiliate picks for this category. Prices change; confirm stock and options on the live page. Use code TBZOQ3JUBY0G at checkout.

Goodman 3-ton 14.5 SEER2 central AC split system (GLXS4BA3610 / AMST36CU1300) — matched R32 condenser + multi-position air handler for ducted whole-home cooling; about $3,997 as listed October 28, 2026; in stock. Condenser is 14.3 SEER2 (listing title uses 14.5 for the system pair). Professional install recommended for warranty and code compliance.
MRCOOL DIY 12,000 BTU 5th Gen mini-split heat pump (DIY-12-HP-WM-115D25-O) — single-zone ductless with 25 ft pre-charged Quick Connect line set; about $2,359 as listed October 28, 2026; in stock. ENERGY STAR / ~23.5 SEER2 class per listing; 115V; covers roughly mid-size rooms up to about 600 sq. ft. under ideal conditions.

Use code TBZOQ3JUBY0G at checkout for the HVACDirect affiliate product discount (about 3%; confirm on hvacdirect.com).

Related equipment

If you heat with electricity, a ducted heat pump replaces both the AC and the furnace; an example is the ACiQ 3-ton 14.3 SEER2 heat pump split system (AC-I-36HP14 / AC-I-36AH14) (about $2,850 as listed October 29, 2026; in stock). If you keep gas heat, the furnace is the other half of a central system; an example is the ACiQ 60,000 BTU 80% AFUE single-stage gas furnace (AQ-GR9S800603AN) (about $888 as listed October 29, 2026; in stock). Both need sizing from a load calculation and licensed install for gas, refrigerant and electrical work. For any 24V ducted system, a smart thermostat such as the Amazon Smart Thermostat (ENERGY STAR; needs a C-wire or adapter; about $80 as of October 29, 2026) adds scheduling and remote control. It isn't for mini-splits that use their own remote, and it doesn't support every two-stage setup, so check compatibility first.

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Bottom line

Keep ducts and need whole-house cooling → look at a matched 3-ton central system that meets your state’s SEER2 floor. Need one room or a duct-free zone → a 12k BTU DIY mini-split is the simpler equipment path. Either way, size from load and layout—not a guess from square footage alone—and hire licensed help when refrigerant or panel work exceeds what your kit and local code allow.

Sources

HVACDirect product page: Goodman 3 Ton 14.5 SEER2 R32 split system GLXS4BA3610 / AMST36CU1300 (checked October 28, 2026)
HVACDirect product page: MRCOOL DIY 12,000 BTU 5th Gen complete system DIY-12-HP-WM-115D25-O (checked October 28, 2026)
U.S. DOE residential central air conditioner & heat pump efficiency standards (SEER2 regional requirements)—confirm current rules for your state before purchase

Information only; not HVAC design, electrical, or refrigerant advice. Follow manufacturer manuals, local codes, and licensed professionals for install and warranty.