Pioneer
The Pioneer Diamante Ultra 12K (115V) is a value-priced single-zone inverter heat pump rated 22 SEER2 / 12.5 EER2 / 9.0 HSPF2 with built-in WiFi and ENERGY STAR Most Efficient status. It still uses R-410A refrigerant.
$1,108
List priceFull set with 16 ft kit, Pioneer/Home Outlet Direct, June 2026. Pre-charged but Pioneer recommends professional evacuation, so not a no-tech DIY unit.
No live retailer for this exact model right now.
The closest split you can buy today:
Pioneer Quantum Ultra High-Wall 12,000 BTU Ductless Mini Split 115VCovers up to 500 sq ft In stock$1,133View compare.ac may earn a commission on purchases, at no cost to you.
Will it cool your room?
This unit's cooling matches a 495 sq ft room. Set your room size to check the fit for your space.
Mini-splits are rated on SEER2, a seasonal scale, not the ENERGY STAR annual-kWh figure this dollar estimate is built from, so there is no comparable figure to show here. A blank is missing data, not a worse result: a mini-split is often the more efficient choice.
Installation cost
$2,500-6,000 fully installed for a typical room (the equipment is roughly $700-1,800, professional installation roughly $1,500-4,000+ depending on line-set run, electrical and access). The unit price you see here is hardware only; installation is the larger, separate cost.
A typical range for this system type, for comparison only, not a quote for this unit. The actual price depends on the line-set run, electrical work and access.
At a glance
Best for budget single-zone cooling and heating up to about 500 sq ft.
This is a single split. This is where regulation bites. Under EPA Section 608 the refrigerant circuit may only be opened by a certified technician, and the EPA is explicit that this includes connecting or disconnecting the pre-charged line sets sold with "DIY" mini-split kits. No federal law stops you doing the mounting, bracketing and line routing yourself, but handling the refrigerant without certification voids the warranty and is a violation. Most US jurisdictions also require permits for a new outdoor unit: typically mechanical or building for the wall penetration and mount, plus electrical for the dedicated 240 V circuit and disconnect. An HOA nearly always has to approve exterior equipment in advance, and local noise ordinances can cap how loud the condenser may be at the property line. This varies by city and county, so confirm with your building department before buying hardware.
Certified installer
R-410A
Compare splits against the other types on price, noise, efficiency and install.
The questions buyers ask, answered from live prices and real specs. See where a split like this fits.
Editor's pickSenville
The Senville LETO 12K (115V) is a budget single-zone inverter heat pump rated 21.2 SEER2 on R-454B, with quiet 17.5 dB minimum indoor noise and built-in WiFi. It suits rooms of roughly 450 to 750 sq ft.
$800
Hardware price
+ pro install, usually $1,500-4,000
Senville
A wall-mounted split air conditioner rated at 9,000 BTU for rooms up to 400 sq ft. It heats in winter too.
Pioneer
A wall-mounted split air conditioner rated at 11,500 BTU for rooms up to 500 sq ft. It heats in winter too.
$729
at Sylvane
+ pro install, usually $1,500-4,000
$664
at Sylvane
+ pro install, usually $1,500-4,000