Mitsubishi P-Series Cased Coil Systems

Lots of homes in colder regions already have a perfectly good gas furnace. The owners don't want to rip it out. They just want better cooling in summer and a cheaper way to heat on mild winter days. A Mitsubishi P-Series Cased Coil is built for that exact situation. It sits right on your furnace and turns the whole setup into a dual fuel system with a Mitsubishi inverter heat pump outside.

Mitsubishi calls this approach intelli-HEAT. The system decides on its own when the heat pump should run and when the furnace should take over, based on outdoor temperature and demand. For a typical 2 ton home, the Mitsubishi PAA 24,000 BTU intelli-HEAT cased coil is a common starting point.

•   Works with most existing gas furnaces

•   intelli-HEAT switches between heat pump and furnace automatically

•   Multi-position A-coil design using R454B refrigerant

How a Cased Coil System Works

The cased coil is an A-shaped refrigerant coil inside a metal cabinet. It sits on top of or next to your furnace, right where the air leaves the blower. The furnace fan pushes air across the coil, and that air then moves through your existing ducts to every room.

Outside, a Mitsubishi P-Series outdoor unit connects to the coil through a refrigerant line set. In summer, it cools. In heating season, a PUZ heat pump model handles most of the load, and the furnace only steps in when it's truly cold. Cooling-only PUY models are also available if you just want better air conditioning.

What intelli-HEAT Actually Does

It's the brain of the dual fuel setup. On a 45°F morning, the heat pump runs because it's the cheaper option. When temperatures drop hard, the system shifts to the furnace. You don't have to flip anything or change settings. It just picks the smarter heat source for the conditions.

•   Heat pump handles mild and moderate weather

•   Furnace steps in during the coldest stretches

Where a Mitsubishi P-Series Cased Coil Fits Best

Homes with a working gas furnace and existing ducts get the most out of it. Instead of starting from scratch, a Mitsubishi P-Series Cased Coil lets you keep the furnace and ducts and upgrade the cooling side. Light commercial buildings with ducted gas heat use it the same way. If you only need cooling, the Mitsubishi PAA 42,000 BTU cased coil with PUY outdoor unit pairs a 3.5 ton coil with an inverter condenser.

Honestly, if you don't have a furnace at all, a Mitsubishi air handler system is usually the better fit. But if the furnace is already there and running well, adding a Mitsubishi P-Series Cased Coil is one of the most practical upgrades you can make.

Getting the Size Right

Match the coil to the outdoor unit capacity, and make sure the furnace blower can move enough air for that tonnage. Duct condition matters too. A leaky duct system wastes a lot of what the coil produces, no matter how efficient the equipment is. A quick load check up front saves a lot of guesswork later.

•   Match coil tonnage to the outdoor unit

•   Confirm furnace blower airflow and duct condition

Key Features of the P-Series Cased Coil Line

Mitsubishi builds these coils for long service in basements, closets, and attics. Some systems in the lineup include Blue Fin anti-corrosion coating, seacoast protection, and a refrigerant leak sensor. Hyper-Heating outdoor units are available too, holding full heating capacity at 5°F so the furnace runs even less.

For larger homes or light commercial spaces, the Mitsubishi PAA 42,000 BTU intelli-HEAT cased coil handles bigger loads. Every Mitsubishi P-Series Cased Coil in this collection works with R454B refrigerant.

•   Anti-corrosion protection on select systems

•   Hyper-Heating outdoor units available for cold climates

Frequently Asked Questions

Q1: What is a Mitsubishi P-Series Cased Coil?

It's an indoor A-coil in a metal cabinet that sits on your furnace and connects to a Mitsubishi P-Series outdoor unit.

Q2: Will it work with my existing furnace?

It's compatible with most gas furnaces, but check blower capacity and fit before ordering.

Q3: What is intelli-HEAT?

It's Mitsubishi's dual fuel control that switches between the heat pump and furnace based on conditions.

Q4: Can I use it for cooling only?

Yes. Pair the coil with a cooling-only PUY outdoor unit.

Q5: Does it work in very cold climates?

Yes. With a Hyper-Heating outdoor unit, the heat pump covers more of the winter and the furnace handles the rest.

Keep Your Furnace, Upgrade Your Comfort

You don't need to start over to get inverter efficiency. Choose the Mitsubishi P-Series Cased Coil that fits your furnace and load, add it to your cart for extra savings, or call 1-866-659-0555 and our team will help you match the right coil and outdoor unit.