Full System Retrofit: Replacing an Old Gas Furnace with a Bosch Light Heat Pump in a Tight Attic

This week our crew tackled one of those projects that looks straightforward on paper but demands real skill in execution. A homeowner on the Indio–La Quinta border needed their aging, inefficient gas furnace and air conditioning unit replaced. The catch? Everything lives in the attic — and it's not a generous one.

When we say tight attic, we mean it. The access hatch barely leaves room to squeeze through with tools, let alone haul up a full air handler. But this is exactly the kind of challenge our team thrives on.

The attic access. Everything for this retrofit — air handler, coil, drain lines — went through here.

Building the Air Handler On-Site

Joe, our lead installer, assembled the new Aspen air handler on-site to configure it for horizontal left air output before maneuvering it into position in that cramped attic space. When you're working in an attic with this little room, you can't just slide a fully assembled unit into place. It takes planning, patience, and knowing your equipment inside and out.

Joe assembling the Aspen air handler for proper horizontal left air output before moving it into the attic.

The New System

For this retrofit, we selected a Bosch Light Series heat pump paired with an Aspen air handler — a combination that delivers serious performance at a more accessible price point than the Bosch Premium Connected line.

The inverter-driven compressor is a major upgrade over the old system. Instead of cycling fully on and off like a traditional unit, it adjusts its speed to match the home's actual cooling or heating demand. That means more consistent temperatures, quieter operation, and significantly lower energy bills — especially important in the Coachella Valley where your system runs hard for months at a time.

The new Aspen air handler installed in the attic — ductwork connected, drain lines run, all in a space with barely any room to work.

The Bosch Light Series condenser on its pad outside — clean install with a tidy electrical run.

$1,200 IID Rebate

One of the best parts of this project? The Bosch Light Series 3-ton heat pump qualifies for IID (Imperial Irrigation District) rebates for homeowners in Indio, La Quinta, and Coachella. After completing the installation, we provided the customer with a rebate submittal packet to send directly to IID.

IID typically mails the rebate check within about a month of submission. This is exactly why we always research available rebates and incentives for our customers. Between utility rebates, the efficiency gains of modern inverter-driven equipment, and the elimination of gas combustion from the home, a heat pump retrofit like this one checks every box: comfort, efficiency, savings, and safety.

The Right Crew for Tight Spaces

Attic retrofits are some of our most rewarding projects. Taking an outdated system out of a difficult space and replacing it with modern, high-efficiency equipment — that's the kind of work our crew takes pride in. It's not glamorous. It's hot, tight, and physically demanding. But when the system fires up and the homeowner feels the difference, that's what makes it worth it.