This is a Carrier Performance Series indoor slim-duct (concealed duct) unit, sold as a standalone component β not a complete system. It's built for installers and homeowners who already have (or are pairing it with) a matched Carrier outdoor condenser, and need a low-profile ducted indoor head for ceiling, wall, or underfloor installation.
Carrier's Performance Ducted Indoor Unit line is engineered for flexible placement β ceiling, wall, or underfloor β and is AHRI-rated only as part of a matched indoor/outdoor system pairing. This 36K slim-duct model (45MBDAQ36XH3) is designed to sit above a drop ceiling or in a joist bay where a visible wall-mounted or cassette head isn't practical. Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
System Components
- Indoor Unit: Carrier Performance Slim Duct Indoor Unit, model 45MBDAQ36XH3 (36K), family 45MBDA
- Outdoor condenser: sold separately β must be a Carrier-matched compatible outdoor unit (not included in this listing)
Installation Requirements & Accessories
- Power supply: 208/230V; 1 Phase; 60Hz
- Refrigerant: R-454B (A2L, mildly flammable classification) with Ester Oil
- Liquid pipe: 3/8" (9.52mm)
- Suction pipe: 3/4" (19mm)
- Line set is NOT included β must be purchased separately and sized per the manual
- Wall sleeve, mounting bracket, and grille are NOT included where applicable
- Not compatible as a standalone unit β requires a matched Carrier outdoor condenser to operate
- Professional installation required β this is not a DIY/pre-charged kit
Pro-Installer Tip
R-454B is a mildly flammable (A2L) refrigerant, which raises the stakes on flare connection quality at both the indoor unit and any field joints along the line set. A loose or under-torqued flare on 3/8" or 3/4" copper won't just cost efficiency β it risks a slow refrigerant leak that shows up months later as reduced capacity or a communication fault between indoor and outdoor boards. Use a calibrated digital torque wrench matched to the flare nut size, and pull the system down below the manufacturer's specified vacuum before charging. This work falls under EPA Section 608 refrigerant handling requirements β verify your technician's certification covers A2L refrigerants before installation.
Key Benefits
- Slim-duct profile fits ceiling, wall, or underfloor installations without a visible indoor head
- Four fan speed settings for airflow control
- Sound levels as low as 22 decibels at the indoor unit
- Compatible with Puron Advance (R-454B) refrigerant, rated for 75% lower global warming potential than legacy refrigerants
- Works with both single-zone and multi-zone Carrier ductless systems
- Wireless handheld remote with temperature sensing included
| Spec | Value | Unit |
|---|---|---|
| Cooling Rated Capacity (DOE A2 - 95Β°F) | 36000 | Btu/h |
| Cooling Rated Capacity (DOE B2 - 82Β°F) | 37000 | Btu/h |
| Heating Rated Capacity (DOE H12 - 47Β°F) | 42000 | Btu/h |
| Heating Rated Capacity (DOE H32 - 17Β°F) | 31600 | Btu/h |
| Heating Rated Capacity (DOE H42 - 5Β°F) | 37600 | Btu/h |
| Voltage / Phase / Frequency | 208/230; 1; 60 | V; Ph; Hz |
| Sound Level (low end) | 22 | dBA |
| Refrigerant Type | R454B | β |
| Refrigerant Oil | Ester Oil | β |
| Liquid Pipe Size | 3/8 (9.52) | in (mm) |
| Suction Pipe Size | 3/4 (19) | in (mm) |
| SEER2 / HSPF2 / EER2 | Dependent on paired outdoor unit | β |
| Breaker Size / MCA / MOCP | [NEEDS VERIFICATION] | β |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- This is the indoor slim-duct unit only β it is not a complete system and will not operate without a compatible Carrier outdoor condenser (sold separately)
- Requires a 3/8" liquid line and 3/4" suction line β line set is NOT included
- Wall sleeve, grille, and mounting bracket are NOT included
- Compatible with Puron Advance (R-454B) refrigerant only β do not charge with legacy refrigerants
- Designed for ceiling, wall, or underfloor concealed installation β not a wall-mounted, cassette, or floor-standing visible head
- Requires professional installation; this is not a DIY pre-charged system
FAQ
What breaker size do I need for this system?
Breaker size for the 45MBDAQ36XH3 indoor unit is [NEEDS VERIFICATION]. The manufacturer data provided does not list MCA/MOCP electrical values specific to this indoor model; confirm with the installation instructions and the paired outdoor unit's nameplate before sizing the circuit.
Is professional installation required to keep the warranty valid, or is this a true DIY kit?
This is not a DIY kit. It uses R-454B refrigerant and requires professional installation, including proper refrigerant handling per EPA Section 608. Carrier's Consumer Choice Warranty offers, upon timely registration, either a 10-year parts-only limited warranty or a 5-year parts plus 3-year labor limited warranty on eligible equipment.
Is the line set included, and if not, what size do I need to buy?
The line set is sold separately. This indoor unit requires a 3/8 inch (9.52mm) liquid line and a 3/4 inch (19mm) suction line. Total piping length allowances are model-specific to the paired outdoor unit; refer to the installation manual for maximum run and lift limits.
Does this system work in cold climates (low-ambient heating)?
Cold-climate heating performance depends on the paired outdoor unit. Manufacturer data lists heating rated capacity at 47Β°F (DOE H12) of 42000 Btu/h, at 17Β°F (DOE H32) of 31600 Btu/h, and at 5Β°F (DOE H42) of 37600 Btu/h for this indoor/outdoor pairing configuration in the source documentation. Confirm exact low-ambient performance with the specific outdoor unit you pair this with.
Compliance & Warranty
Installation by a licensed HVAC professional is required to maintain warranty. This unit uses R-454B (A2L) refrigerant, which requires EPA Section 608 certified handling. Upon timely registration, Carrier's Consumer Choice Warranty offers eligible equipment either a 10-year parts-only limited warranty or a 5-year parts plus 3-year labor limited warranty. Refer to the "Resources (System Manuals and Warranty)" Tab above for full warranty terms and registration requirements.
