SplitAtlas

Senville / LETO Series

Senville LETO 12k R-454B 115V Mini-Split

Certified capacity
12,000 BTU/h[3]
SEER2
21.2 SEER2[3]
Heating floor
5 F[1]
Voltage
103.5-126.5[1]
Install path
Professional install / DIY-marketed

The LETO 12k on 115V is the volume seller in Senville's entry line: SEER2 21.2 on a standard circuit, which keeps the install cheap. The limit is the +5F heating floor. For a bedroom or living room in a cooling climate that is fine; for anything that needs winter heat, the AURA 12k is the honest recommendation.

1 zoneProfessional install / DIY-marketedCurrent

Refrigerant generation

R-454B - current-generation refrigerant

Paid link

$800 / Checked Jul 24, 2026

$800 at Senville

Need this installed?

Get installation quotes
Error Codes
Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL) mini-split heat pump indoor wall unit and outdoor condenser

Image: Senville

Data completeness: 88%
Last sourced
Aug 17, 2026

SplitAtlas score

7.8 / 10

Methodology
Cooling efficiencyBelow average

(21.2 SEER2) among 12k systems

Heating efficiencyBottom quartile

(8.7 HSPF2) among 12k systems

Cold-weather performanceBottom quartile

(5F certified capacity: 55% of the 47F rating; 5 F heating floor) among 12k systems

NoiseTop quartile

(17.5 dBA indoor min / 54 dBA outdoor) among 12k systems

WarrantyBottom quartile

(5 yr parts / 5 yr compressor) across the catalogue

Installation accessibilityBelow average

(DIY-marketed; 25 ft precharged; 16 ft included line set) across the catalogue

Feature setBelow average

(4 verified features) across the catalogue

Price-to-performanceTop quartile

($800 median retail) among 12k systems

Documentation & partsTop 10%

(11 manuals; spec sheet; 51 error-code rows; parts channel) across the catalogue

Key ratings

Rated cooling

12,000BTU/h[3]

Rated heating

12,000BTU/h[3]

Buyer review snapshot

Best for / skip if

Best for

  • Homes planning around a 103.5-126.5 branch circuit.

Install difficulty

Professional flared-line install
  • Electrical: 103.5-126.5; MCA 19 A; breaker/fuse 20 A.
  • Line set: Flared line connections; precharged 25 ft; included 16 ft; max 25 ft.

Alternatives

Availability and price context

  • Last seen at Senville on Jul 24, 2026: $799.99. Open the listing for today's price.
  • Last seen at HVACDirect on Jul 24, 2026: $799.98. Open the listing for today's price.

Source date

Model data sourced
Aug 17, 2026
Page reviewed
Jul 24, 2026
Source-backed records
4
Newest source retrieved
Aug 17, 2026

Warranty tiers

Base
5 yr parts / 5 yr compressor - published warranty terms

The score uses Base. Additional published terms are shown for reference and not counted in the score.

Review methodology

Strengths

  • SEER2 21.2 on a standard 115V circuit.
  • Keeps install cost down by avoiding a new circuit.

Weaknesses

  • +5F heating floor rules it out for winter use.
  • 115V inrush on a shared circuit.

Climate suitability

Minimum heating ambient
5 F[1]
Certified heating at 5F
6,600 BTU/h[3]
Rated heating at 17F
9,000 BTU/h[3]
Rated heating at 47F
12,000 BTU/h[3]

Specifications

Show
Manufacturer
Senville
Brand
Senville
Product line
LETO Series
Model number
SENL-12CD-ILL indoor / SENL-12CD-OL outdoor
Indoor unit model
SENL-12CD-ILL
Outdoor unit model
SENL-12CD-OL
Number of zones
1
Max indoor units
not published
Rated cooling capacity
12,000 BTU/h[3]
Rated heating capacity
12,000 BTU/h[3]
Voltage
103.5-126.5[1]
MCA
19 A[1]
Maximum fuse or breaker size
20 A[1]
Breaker needed
not published
SEER2
21.2 SEER2[3]
EER2
10.1 EER2[3]
HSPF2 (Region 4)
8.7 HSPF2[3]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
1.85 COP[3]
Minimum outdoor heating temperature
5 F[1]
Minimum outdoor cooling temperature
not published
Maximum outdoor temperature
not published
Indoor noise range
45.0 / 40.5 / 32.5 / 25.0 / 17.5[1]
Outdoor noise rating
54 dBA[1]
Indoor weight
19.4 lb[1]
Outdoor weight
61.29 lb[1]
Refrigerant
R-454B[3]
Refrigerant charge
not published
Manufacturer coverage
not published
Line-set size
not published
Included line-set length
16 ft[1]
Maximum line-set length
25 ft[1]
Max line set per indoor
not published
Maximum elevation difference
not published
Max height between indoor units
not published
Wi-Fi support
supported[1]
Energy Star status
Not ENERGY STAR certified[4]
AHRI certification number
215735287[3]
Warranty
Base: 5 yr parts / 5 yr compressor (published warranty terms). Score uses Base.. 5 Years Compressor / 5 Years Parts
Install path
Professional install / DIY-marketed
Marketing install label
DIY-marketed
Retail price
$799.99
Available retailers
Senville
Manual links
LETO 12,000 BTU ahri certificate, AHRI Appendix M1 public detail record 215735287, LETO 12,000 BTU energy guide, ENERGY STAR exact-match row check for AHRI 215735287, Senville LETO Installation Manual, LETO 12,000 BTU owner manual, LETO 12,000 BTU service manual, Senville LETO Series Error Code Reference Guide plus official EL 0C and PC 0L support articles, LETO 12,000 BTU Senville product-page specifications, LETO 12,000 BTU warranty
Specification sheet
LETO 12,000 BTU Senville product-page specifications
Last sourced date
Aug 17, 2026

Retail purchase context

Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure

Paid link

$800 at Senville

$800 / Checked Jul 24, 2026

Check price at Senville

Reference-only price

Last seen at HVACDirect on Jul 24, 2026: $800

Parts and filters

Fits Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL). Part numbers and fit notes identify compatibility only; no manufacturer endorsement is implied.

air-filter

Indoor filters (SENL/12CD/IX - SENL/12CD/IY - SENL/12CD/ILL)

Fits
Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL)
OEM part number
PL12444
Filter care
Washable. Wash with warm, soapy water, rinse, and air-dry every 2 weeks. No replacement interval or condition is published for this reusable filter.
Fit note
Fits SENL-12CD-ILL / SENL-12CD-OL. Senville publishes this LETO ILL-family filter SKU and sells it directly at https://senville.com/indoor-filters-senl-12cd-ix/. HVACDirect did not expose an exact Senville filter page, so no affiliate offer is attached.
Source
Senville LETO filter product page, Product details, page product page (PL12444)

remote-control

Remote control (ILL)

Fits
Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL)
OEM part number
PAR669
Fit note
Fits SENL-12CD-ILL / SENL-12CD-OL. Senville sells the ILL replacement remote directly at https://senville.com/remote-control-ill/. HVACDirect did not expose an exact Senville remote page, so no affiliate offer is attached.
Source
Senville Remote Control (ILL), Product details, page product page (PAR669)

smart-wifi-usb-kit

Senville Smart WiFi USB Kit for Mini Split, Works with Alexa

Fits
Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL)
OEM part number
SEN20-ACK1T
Fit note
Fits SENL-12CD-ILL / SENL-12CD-OL. Senville publishes SEN20-ACK1T for compatible post-2019 indoor units and sells it directly at https://senville.com/senville-smart-wifi-usb-kit-for-mini-split-works-with-alexa/. HVACDirect did not expose an exact Senville Wi-Fi kit page, so no affiliate offer is attached.
Source
Senville Smart WiFi USB Kit for Mini Split, Works with Alexa, Product details, page product page (SEN20-ACK1T)

line-set-installation-kit

25 ft flared line-set installation kit - 1/4 x 3/8

Fits
Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL)
OEM part number
PJX-1-75E
Fit note
Fits SENL-12CD-ILL / SENL-12CD-OL. Use this size for 6k, 9k, and 12k Senville indoor units or matching multizone ports. Senville sells the PJX-1-75E line set directly; HVACDirect was verified as a live exact-dimension 25 ft install-kit page on 2026-08-01. First-party path: https://senville.com/25-ft-insulated-line-set-1-4-and-3-8/.
Source
Senville 25 Ft. Insulated Line Set - 1/4 and 3/8, Technical Specifications, page product page (SKU | PJX-1-75E)

Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure

Paid link

Check price at HVACDirect
Find this model's filterReplacement Parts & Filters

Electrical requirements

Show
Voltage
not published
Voltage range
103.5-126.5[1]
Phase
single-phase[1]
Frequency
60 Hz[1]
MCA
19 A[1]
Breaker needed
not published
Maximum breaker size
not published
Maximum fuse size
20 A[1]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
14*4 AWG[1]

Installation considerations

Show
Liquid line
not published
Suction line
not published
Line connection type
Flared line connections[2]
Precharged length
25 ft[1]
Included line-set length
16 ft[1]
Maximum line-set length
25 ft[1]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
31.57 in W x 11.69 in H x 7.44 in D[1]
Outdoor dimensions
30.12 in W x 21.85 in H x 11.93 in D[1]
Indoor weight
19.4 lb[1]
Outdoor weight
61.29 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL) myself, or do I need a pro?
Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL) is built for professional installation: the line set must be flared, evacuated, and charged, which requires EPA-certified refrigerant handling. Installing it outside the manufacturer's requirements can void the warranty, so budget for a qualified HVAC installer.
Will the Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL) keep heating in a cold winter?
The AHRI/ENERGY STAR certification lists 6,600 BTU/h of heating capacity at 5F. Rated heating operation extends down to 5 F. Certified heating efficiency is 8.7 HSPF2. Match those numbers against your climate's design temperature - in cold regions, output at 5F matters far more than the nameplate capacity measured at 47F.
What electrical circuit does the Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL) need?
Published electrical requirements: 103.5-126.5 voltage, 19 A minimum circuit ampacity, and 20 A maximum breaker or fuse sizing. Confirm the final circuit against the unit nameplate and local code with a licensed electrician.
How far can the outdoor unit be from the indoor head?
The published maximum line-set length is 25 ft. The outdoor unit's factory charge covers up to 25 ft of line; longer runs need added refrigerant. A 16 ft line set is included. Longer runs than the included set allows require a different line set, so measure the planned routing before ordering.
What warranty does the Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL) carry?
The manufacturer publishes these warranty tiers: Base: 5 yr parts / 5 yr compressor (published warranty terms). Score uses Base.. Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.

Data sources

Show
  1. Senville: Senville LETO 12,000 BTU R-454B 115V (SENL-12CD-ILL / SENL-12CD-OL) official product pageSourced - manufacturer product page

    Covers Frequency, Maximum fuse size, Minimum circuit ampacity, Phase, Manufacturer wire notes, Voltage range and more

  2. Senville: Senville LETO Installation ManualSourced - manufacturer technical document

    Covers Line connection type

  3. AHRI certificate #215735287 - search the AHRI DirectorySourced - AHRI directory

    Covers AHRI certification number, Rated cooling capacity, COP at 5F, EER2, Rated heating capacity, HSPF2 (Region 4) and more

  4. ENERGY STAR: ENERGY STAR exact row check for AHRI 215735288Sourced - Energy Star listing

    Covers Energy Star status

Last updated

Jul 24, 2026