MRCOOL DIY or Senville: which mini split should I buy?

At 12,000 BTU: the MRCOOL DIY Select if you will install it yourself, the Senville LETO if a pro will and you want the lowest price, the Senville AURA if a pro will and heating matters. Unit plus typical installer labor is $1,549 for the Select, $2,800 for the LETO and $3,400 for the AURA.

Why does the MRCOOL DIY Select cost more than the Senville LETO?

You are paying for a unit that needs no installer: its quick-connect line set means no vacuum pump, gauges or brazing. The Select is $749.01 more on Amazon, but the LETO needs an installer at $1,000 to $4,500+ (typical $2,000), so the LETO comes to about $2,800 installed against $1,549 for the Select.

Can I install a Senville mini split myself?

Senville's product pages say "Professional installation required." 11 of the 13 Senville listings we read on Amazon say a professional must install the unit. If you want to install it yourself, a quick-connect DIY kit like the MRCOOL DIY Select is built for that.

Does installing the MRCOOL DIY Select myself void its warranty?

Not by itself. MRCOOL's warranty applies to systems "installed according to the installation instructions" and local codes and permits, with 1 year on parts and 2 years on the compressor and no registration. It excludes "failure, damage or repairs due to faulty installation" and does not cover labor, and a licensed HVAC contractor may be needed where the law requires one.

How much does it cost to have a Senville mini split installed?

PickHVAC prints installation labor of $1,000 low, $2,000 typical and $4,500+ high. Added to the Amazon price, that is about $2,800 for the LETO and $3,400 for the AURA at typical labor. For a whole 12,000 BTU one-zone job, equipment included, the HomeGuide and TLS ranges FixItCost quotes are $2,800 to $5,200. The AURA runs on 208-230 V; a new 240-volt circuit is about $300 to $1,500 when the panel has room.

How much does the Senville AURA save a year over the LETO?

About $62 a year, about $45 of it from heating, on 1,000 hours of each at $0.1883/kWh, from the certified 25.4 vs 21.2 SEER2 and 10.5 vs 8.7 HSPF2. The AURA costs $600.00 more, a payback of about 9.7 years on that basis.

How cold can the Senville LETO and AURA heat?

Senville's LETO listing says its heat pump is "functional up to 5F/-15C," and AHRI certifies 6,600 BTU at 5°F (55% of its 47°F output). The AURA is cold-climate rated: AHRI certifies 11,500 BTU at 5°F (96%), and its listing says it heats "up to -22°F/-30°C."

Which of these are ENERGY STAR certified?

The Senville AURA 12,000 BTU pair (SENA-12HF-OG + SENA-12HF-IGG) is on ENERGY STAR's list. The 12,000 BTU LETO pair (SENL-12CD-OL + SENL-12CD-ILL) and the MRCOOL DIY Select pair (DIYS-12-HP-C-115A11-O + DIYS-12-HP-WMAH-115A13 - O) were not.

AHRI-certified numbers · Amazon prices on November 11, 2026

MRCOOL DIY vs Senville: Which Mini Split Should You Buy?

Installing it yourself? Buy the MRCOOL DIY Select, the only one of the three sold as DIY. Hiring a pro? Buy the Senville LETO to spend the least, or the AURA if heating matters.

You install it yourself

MRCOOL DIY Select 12,000 BTU 115V

$1,549.00 · 17.5 SEER2 · 9 HSPF2 · no installer needed

MRCOOL's warranty covers a unit you install per its instructions. ^[4]
Check price on Amazon
A pro installs it, lowest price

Senville LETO 12,000 BTU 110V

$799.99 · 21.2 SEER2 · 8.7 HSPF2 · pro install required

Senville says a DIY install voids the warranty. ^[5]
Check price on Amazon
A pro installs it, heating matters

Senville AURA 12,000 BTU 208-230V

$1,399.99 · 25.4 SEER2 · 10.5 HSPF2 · cold-climate · ENERGY STAR

Senville says a DIY install voids the warranty. ^[5]
Check price on Amazon

Prices are the Amazon buy-box price on November 11, 2026 and change often. SEER2 rates cooling efficiency and HSPF2 rates heating efficiency; a higher number costs less to run.

The numbers, as of November 11, 2026: certified numbers from the AHRI Directory, prices from Amazon.

By Erin Rose · Updated November 10, 2026

01 / Installed cost

What each one costs installed

Unit price is the Amazon buy-box price. Labor is the installer-labor row in the PickHVAC price guide, the same one on our mini-split cost page. A full 12,000 BTU one-zone job, equipment included, runs $2,800 to $5,200 in the HomeGuide and TLS Air Conditioning price ranges that FixItCost quotes.

Installed cost
Measure	MRCOOL DIY Select	Senville LETO	Senville AURA	Source
Unit on Amazon	$1,549.00	$799.99	$1,399.99	Amazon buy box ^[3]
Installer labor	$0 (you install it)	$1,000 to $4,500+, typical $2,000	$1,000 to $4,500+, typical $2,000	PickHVAC, Oct 7, 2026 ^[8]
Unit plus typical labor	$1,549	$2,800	$3,400	computed ^[8]
Unit plus low to high labor	$1,549	$1,800 to $5,300+	$2,400 to $5,900+	computed ^[8]
Typical total with a new 240-volt circuit	—	—	$3,700 to $4,900	computed ^[8]
Electrical	runs on a household circuit	runs on a household circuit	240-volt circuit, about $300 to $1,500 if you have none and the panel has room	PickHVAC: when the panel has room ^[8]

The labor row has a $4,500+ top end, so a high total is shown with a plus. The 115 V and 110 V units run on a household circuit, so no electrician line is shown for them, as on the cost page: our sources price a circuit only for 240 V.

02 / Side by side

The three units, number by number

All three are 12,000 BTU single-room wall units that use the same refrigerant, R-454B. SEER2 rates cooling efficiency, EER2 rates it on a hot day, and HSPF2 rates heating efficiency; a higher number costs less to run. The line set is the pair of copper pipes that joins the indoor and outdoor units. Cold-climate rated means AHRI certifies the unit for heating in cold weather. The shaded cell is the best number in the row.

Side-by-side numbers
Measure	MRCOOL DIY Select	Senville LETO	Senville AURA	Source
Size (certified cooling)	12,000 BTU	12,000 BTU	12,000 BTU	AHRI ^[1]
Voltage, per the listing	115 V	110 V	208-230 V	listing ^[3]
Line set in the box	11.5 ft, pre-charged quick-connect	16 ft	16 ft	listing ^[3]
SEER2 (cooling efficiency)	17.5	21.2	25.4	AHRI ^[1]
EER2 (efficiency on a hot day)	8.5	10.1	13.4	AHRI ^[1]
HSPF2 (heating efficiency)	9	8.7 (Region IV)	10.5 (Region IV)	AHRI; Senville pages ^[1]^[6]^[7]
Heat output at 5°F	6,200 BTU (52% of its 47°F output)	6,600 BTU (55% of its 47°F output)	11,500 BTU (96% of its 47°F output)	AHRI ^[1]
Cold-climate rated	no	no	yes	AHRI ^[1]
ENERGY STAR	no	no	yes	ENERGY STAR ^[2]
Who may install it	You. MRCOOL's warranty covers systems installed per its instructions	"Professional installation required"	"Professional installation required"	maker ^[4]^[6]^[7]
Warranty, per the maker	1 yr parts, 2 yr compressor	5 yr parts, 5 yr compressor	5 yr parts, 10 yr compressor	maker ^[4]^[6]^[7]
Amazon price on November 11, 2026	$1,549.00	$799.99	$1,399.99	Amazon buy box ^[3]
Price per 1,000 BTU	$129.08	$66.67	$116.67	computed ^[3]
Yearly running cost	$380	$366	$304	computed, 1,000 h cooling + 1,000 h heating, $0.1883/kWh ^[11]
Certified model pair	DIYS-12-HP-C-115A11-O + DIYS-12-HP-WMAH-115A13 - O	SENL-12CD-OL + SENL-12CD-ILL	SENA-12HF-OG + SENA-12HF-IGG	AHRI refs 218004485, 215735287, 215735296 ^[1]

Certified numbers are the AHRI ratings for the exact outdoor and indoor model pair each listing prints; the Senville AURA pair is the one whose numbers match Senville's own product page (25.4 SEER2, 10.5 HSPF2). Senville's pages also list a Region V HSPF2 (6.7 for the LETO, 8 for the AURA); the Region IV figures shown here are the ones AHRI certifies. Running cost is 1,000 hours of cooling and 1,000 hours of heating at the certified 12,000 BTU, at $0.1883/kWh, the EIA U.S. average; your rate and hours move it.

03 / Install and warranty

Who may install it, and what the maker says

MRCOOL DIY Select: you can install it. MRCOOL's warranty (rev. 03.31.26) gives 1 year on parts and 2 years on the compressor with no registration. It applies to systems "installed according to the installation instructions," and a licensed HVAC contractor is needed only "when required by law" or for diagnostics MRCOOL directs. Its quick-connect line set means "no vacuum pump, gauges, brazing, or refrigerant handling are required." ^[4]^[3]
Senville LETO and AURA: a pro installs them. Senville's product pages say "Professional installation required" for both. Senville's warranty page says: "DIY installation will void your warranty coverage," and "Pressure testing and evacuation of line sets must be completed by a licensed HVAC professional" (evacuation means pulling the air and moisture out of the refrigerant pipes). The LETO carries 5 years on parts and 5 on the compressor. The AURA carries 5 years on parts and 10 on the compressor. Senville notes that coverage periods can vary by series. ^[6]^[7]^[5]
None of the three covers labor. MRCOOL's warranty excludes "labor or other costs incurred for diagnosing, repairing, removing, installing"; Senville's page says "installation and repair labor is arranged separately with your HVAC professional." ^[4]^[5]
Most Senville listings say the same. Of the 13 Senville system listings we read on Amazon on September 29, 2026, 11 say a professional must install the unit and none call it DIY. 13 of 14 MRCOOL system listings say DIY. ^[10]

04 / Which one

Which one for which buyer

Installing it yourself: the MRCOOL DIY Select. It costs $1,549.00, which is $749.01 more than the LETO. The LETO plus typical installer labor comes to $2,800, so the Select is $1,251 less once you count the install. It rates 17.5 SEER2 and 9 HSPF2, with 6,200 BTU at 5°F (52% of its 47°F output). It is not cold-climate rated.
A pro installs it and you want the lowest price: the Senville LETO. $799.99 on Amazon, 21.2 SEER2 and 8.7 HSPF2. Senville's listing says the heat pump is "functional up to 5F/-15C," and AHRI certifies 6,600 BTU at 5°F, 55% of its 47°F output. In weather colder than that range, it needs another heat source.
A pro installs it and heating matters: the Senville AURA. 25.4 SEER2 and 10.5 HSPF2, cold-climate rated and ENERGY STAR certified. AHRI certifies 11,500 BTU at 5°F, 96% of its 47°F output. Its listing says it heats "up to -22°F/-30°C." It runs on 208-230 V, so ask your installer about the circuit.

05 / Running cost

What the AURA saves a year over the LETO

About $62 a year. On 1,000 hours of cooling and 1,000 hours of heating a year at $0.1883/kWh, the LETO costs about $366 to run and the AURA about $304. Heating accounts for about $45 of it. The AURA costs $600.00 more than the LETO, a payback of about 9.7 years on this basis. More heating hours, or a higher electric rate, shorten that. ^[11]
In cold weather the gap is bigger. At 5°F the AURA still gives 11,500 BTU against the LETO's 6,600. That is the number to compare if your winter days reach single digits.

06 / Other sizes

Other sizes

MRCOOL's DIY Select is the line on this page at 12,000 BTU, and it is the match at 18,000 and 24,000 BTU too. Same rule: same size, same voltage, certified numbers for the exact model pair.

18,000 BTU class, 230 V

MRCOOL DIY Select

17.3 SEER2 · 8.5 HSPF2 · 9,500 BTU at 5°F · $1,690.00 ($99.41 per 1,000 certified BTU; certified at 17,000 BTU)
Check price on Amazon

Senville LETO

19.2 SEER2 · 9.6 HSPF2 · 11,500 BTU at 5°F · $999.99 ($55.55 per 1,000 certified BTU; certified at 18,000 BTU)
Check price on Amazon

The MRCOOL is the DIY kit at this size. The Senville LETO needs a pro install.
24,000 BTU class, 230 V

MRCOOL DIY Select

16.5 SEER2 · 8.3 HSPF2 · 16,500 BTU at 5°F · $1,899.00 ($82.57 per 1,000 certified BTU; certified at 23,000 BTU)
Check price on Amazon

Senville LETO

18.7 SEER2 · 9.3 HSPF2 · 17,000 BTU at 5°F, cold-climate, ENERGY STAR · $1,249.99 ($52.08 per 1,000 certified BTU; certified at 24,000 BTU)
Check price on Amazon

The MRCOOL is the DIY kit at this size. The Senville LETO needs a pro install and is cold-climate rated and ENERGY STAR.

Same rule at each size: same BTU class, same voltage, certified numbers for the exact model pair.

07 / Questions

Frequently asked

MRCOOL DIY or Senville: which mini split should I buy?: At 12,000 BTU: the MRCOOL DIY Select if you will install it yourself, the Senville LETO if a pro will and you want the lowest price, the Senville AURA if a pro will and heating matters. Unit plus typical installer labor is $1,549 for the Select, $2,800 for the LETO and $3,400 for the AURA. ^[1]^[3]^[8]
Why does the MRCOOL DIY Select cost more than the Senville LETO?: You are paying for a unit that needs no installer: its quick-connect line set means no vacuum pump, gauges or brazing. The Select is $749.01 more on Amazon, but the LETO needs an installer at $1,000 to $4,500+ (typical $2,000), so the LETO comes to about $2,800 installed against $1,549 for the Select. ^[4]^[8]^[3]
Can I install a Senville mini split myself?: Senville's product pages say "Professional installation required." 11 of the 13 Senville listings we read on Amazon say a professional must install the unit. If you want to install it yourself, a quick-connect DIY kit like the MRCOOL DIY Select is built for that. ^[5]^[6]^[7]^[10]
Does installing the MRCOOL DIY Select myself void its warranty?: Not by itself. MRCOOL's warranty applies to systems "installed according to the installation instructions" and local codes and permits, with 1 year on parts and 2 years on the compressor and no registration. It excludes "failure, damage or repairs due to faulty installation" and does not cover labor, and a licensed HVAC contractor may be needed where the law requires one. ^[4]
How much does it cost to have a Senville mini split installed?: PickHVAC prints installation labor of $1,000 low, $2,000 typical and $4,500+ high. Added to the Amazon price, that is about $2,800 for the LETO and $3,400 for the AURA at typical labor. For a whole 12,000 BTU one-zone job, equipment included, the HomeGuide and TLS ranges FixItCost quotes are $2,800 to $5,200. The AURA runs on 208-230 V; a new 240-volt circuit is about $300 to $1,500 when the panel has room. ^[8]^[9]^[3]
How much does the Senville AURA save a year over the LETO?: About $62 a year, about $45 of it from heating, on 1,000 hours of each at $0.1883/kWh, from the certified 25.4 vs 21.2 SEER2 and 10.5 vs 8.7 HSPF2. The AURA costs $600.00 more, a payback of about 9.7 years on that basis. ^[1]^[11]
How cold can the Senville LETO and AURA heat?: Senville's LETO listing says its heat pump is "functional up to 5F/-15C," and AHRI certifies 6,600 BTU at 5°F (55% of its 47°F output). The AURA is cold-climate rated: AHRI certifies 11,500 BTU at 5°F (96%), and its listing says it heats "up to -22°F/-30°C." ^[3]^[1]
Which of these are ENERGY STAR certified?: The Senville AURA 12,000 BTU pair (SENA-12HF-OG + SENA-12HF-IGG) is on ENERGY STAR's list. The 12,000 BTU LETO pair (SENL-12CD-OL + SENL-12CD-ILL) and the MRCOOL DIY Select pair (DIYS-12-HP-C-115A11-O + DIYS-12-HP-WMAH-115A13 - O) were not. ^[2]

How we did this

Method

We matched on size. Each unit is a single-zone 12,000 BTU wall unit with an Add to Cart button and a price on Amazon on November 11, 2026. Each listing prints a model code; we looked up the matching outdoor and indoor pair in the AHRI Directory and used the rating for that pair.

Senville's listings print a kit code (SENL-12CD-16 for the LETO, SENA-12HF-16 for the AURA). The LETO is certified as the SENL-12CD-OL outdoor unit with the SENL-12CD-ILL indoor unit. Several AHRI ratings exist for the AURA outdoor unit with different indoor units; we used the SENA-12HF-OG with the SENA-12HF-IGG pair, the one whose 25.4 SEER2 and 10.5 HSPF2 match Senville's own product page.

ENERGY STAR status is the program's own list, looked up by AHRI reference number. Warranty and install terms are quoted from the maker's own pages, read on November 8, 2026. Price is the buy-box price on the listing page that day; it changes often.

Running cost = rated BTU × hours ÷ efficiency ÷ 1,000 × $0.1883/kWh, with 1,000 hours each of cooling (SEER2) and heating (HSPF2). Installed total = Amazon price + the PickHVAC labor row. The payback divides the price gap by the yearly running-cost gap.

References

Sources

11 references · checked November 11, 2026

1
AHRI Directory of Certified Product Performance, air-source heat pumps (program 99), active ratings

queried by model number · October 1, 2026 (the Senville AURA pair on November 8, 2026) · reference numbers in the table
2
ENERGY STAR certified heat pumps (data.energystar.gov, dataset w7cv-9xjt)

queried by AHRI reference number · October 1, 2026; the Senville AURA record November 8, 2026
3
Amazon listings for the units on this page (prices November 11, 2026; specs read October 1, 2026)

price and seller November 11, 2026. Voltage, refrigerant, line set and install note read October 1, 2026; the Senville AURA listing November 8, 2026.
4
MRCOOL DIY limited warranty (PDF, rev. 03.31.26)

read November 8, 2026 · 1 year parts, 2 years compressor, no registration, installed per the installation instructions
5
Senville warranty registration page (senville.com)

read November 8, 2026 · 10 years compressor, 5 years parts, "coverage periods may vary by product series"
6
Senville LETO 12,000 BTU product page (senville.com, SENL-12CD)

read November 8, 2026 · 21.2 SEER2, 8.7 HSPF2, 5 years compressor and parts, professional installation required
7
Senville AURA 12,000 BTU product page (senville.com, SENA-12HF)

read November 8, 2026 · 25.4 SEER2, 10.5 HSPF2, 10 years compressor and 5 years parts, professional installation required
8
PickHVAC, mini split price installed (installation labor, circuit and line-set rows)

PickHVAC, Oct 7, 2026 · labor low $1,000, typical $2,000, high $4,500+
9
FixItCost, mini split installation cost (HomeGuide and TLS Air Conditioning ranges for a 12,000 BTU unit)

checked Oct 20, 2026 · the same source the mini-split cost page uses
10
Amazon mini-split listings: 161 system listings read on September 29, 2026

install claim and refrigerant as each listing states them · September 29, 2026
11
U.S. average residential electricity price used for running cost: $0.1883/kWh

EIA · the same figure every running cost on this site uses