HVACZAR - Authorized MrCool Dealer
MRCOOL 11.5 ft 3/8 x 5/8 Pre-Charged Line Set — R-454B
MRCOOL 11.5 ft 3/8 x 5/8 Pre-Charged Line Set — R-454B view 2
MRCOOL 11.5 ft 3/8 x 5/8 Pre-Charged Line Set — R-454B view 3
1 / 3
DIY 5th Gen·DIY Install

MRCOOL 11.5 ft 3/8 x 5/8 Pre-Charged Line Set — R-454B

SKU DIY11-3858-O

Custom quote
Sold out at MrCool right now

We price this to your job and email you a link to purchase — usually within one business day.

Customize it — compatible add-ons only

Joins two line sets end-to-end for extra-long runs — MrCool's official method.

Clean channel for the lines running down your exterior wall.

Universally compatible tools and care items — maintenance kit, coil cleaner, install tools.

7-year warranty · Factory-backed by MrCool
Ships nationwide · exact freight at checkout · Ships in 1-3 business days
30-day returns on unopened products · See policy
Secure checkout:Visa · Mastercard · Amex · Discover
Limited Lifetime Compressor Warranty7-Year Unit Replacement (Compressor) Warranty5-Year Parts Warranty

MrCool DIY factory warranty — register after install to activate the full coverage tiers.

Sizing Help

Not sure if this system is right for your space?

Proper sizing prevents short-cycling, high bills, and premature failure. Our sizing tool takes 60 seconds.

Match My SpaceOr call (657) 582-0899

Description

Pre-charged Quick Connect® line set for the MRCOOL DIY® Select series — no vacuum pump, no gauges.

What's in the Box

Here's what you'll receive with your order

Pre-Charged Refrigerant Line Set

5ft pre-charged copper lines

Quick Connect Fittings

Flare fittings for tool-free connection

DIY Install — No HVAC license required
Patented Quick Connect® fittings
No vacuum pump needed
Energy Star certified
7 Years compressor warranty
Compressor: 7 Years warrantyParts: 5 Years warranty

MRCOOL 11.5 ft 3/8 x 5/8 Pre-Charged Line Set — R-454B — Model Details

What this specific model is sized for, how it installs, how it performs, and what it costs to run.

Install Difficulty — DIY-Friendly

This DIY-series system ships with a pre-charged Quick Connect line set — no HVAC license, no vacuum pump, no refrigerant gauges. The pre-charged fittings use a hand-tightened mechanical seal that a homeowner completes in 15 minutes per connection. Typical install time from unboxing to first cool air is 4–8 hours for a single-head system.

Product Details

Pre-charged Quick Connect® line set for the MRCOOL DIY® Select series — no vacuum pump, no gauges. Model DIY11-3858-O. Specifications from the MRCOOL product catalog (2026 edition, p.78). This item is quoted to your job — request a quote and we will email you a price with a link to purchase, usually within one business day.

Frequently Asked Questions

Everything you need to know about this product

Can I install this myself without an HVAC license?

Yes — the DIY series uses pre-charged Quick Connect line sets that tighten by hand. No vacuum pump, no refrigerant handling, no EPA 608 certification required. Most single-zone installs take 4–8 hours. You may still need a permit and an electrician for the 240V circuit, depending on local code.

How fast does HVACZAR ship this unit?

Shipping is calculated at checkout from the order weight, and you see the exact charge before paying. In-stock SKUs leave the warehouse within 1–3 business days. Transit time is 3–7 business days via truck freight (with liftgate delivery) for outdoor units and UPS Ground for accessories. Tracking is emailed at pickup.

What if it arrives damaged or I change my mind?

Inspect the unit before signing for freight delivery. If there is visible damage, note it on the delivery receipt and refuse the shipment — we ship a replacement at no cost. Unopened and unused units can be returned within 30 days for a refund less outbound shipping.

What is the warranty on the MRCOOL 11.5 ft 3/8 x 5/8 Pre-Charged Line Set — R-454B?

The MRCOOL 11.5 ft 3/8 x 5/8 Pre-Charged Line Set — R-454B comes with a 7-year manufacturer warranty when purchased from HVACZAR, an authorized MrCool dealer. Register your unit after purchase to activate full warranty coverage.

How long does shipping take?

Shipping is calculated at checkout from the order weight. Most MrCool systems ship within 1-3 business days and arrive in 3-7 business days via FedEx, UPS, or truck freight with liftgate delivery.

Do you offer returns?

Yes. HVACZAR offers a 30-day return policy on unopened, unused products in original packaging. Contact us to initiate a return and receive a return authorization number.

How can I pay?

We accept all major credit cards (Visa, Mastercard, American Express, Discover) via Stripe secure checkout. All transactions are encrypted and protected.

Related Products

MRCOOL 11.5 ft 1/4 x 1/2 Pre-Charged Line Set — R-454B

MRCOOL 11.5 ft 1/4 x 1/2 Pre-Charged Line Set — R-454B

$0.00
MRCOOL 11.5 ft 1/4 x 3/8 Pre-Charged Line Set — R-454B

MRCOOL 11.5 ft 1/4 x 3/8 Pre-Charged Line Set — R-454B

$0.00
Lineguard 4.5in Line Set Cover - Gray

Lineguard 4.5in Line Set Cover - Gray

$133.00
Lineguard 4.5in Line Set Cover - Tan

Lineguard 4.5in Line Set Cover - Tan

$133.00

Ships Nationwide — Shop by State

We deliver the MRCOOL 11.5 ft 3/8 x 5/8 Pre-Charged Line Set — R-454B to all 50 states via FedEx, UPS, and truck freight. Each state page lists local rebate programs and utility incentives.

TexasFloridaCaliforniaNew YorkGeorgiaNorth CarolinaArizonaPennsylvaniaOhioMichiganIllinoisVirginiaWashingtonMassachusettsColorado
View all 50 states →