Similar to most other HVAC units, the heat pump has an indoor air filter that must be cleaned periodically. The heat pump also has a condensate filter that requires periodic cleaning. Cleaning in both cases must be done following the instructions in the manual.

Like other heat pump systems, the Gradient Window Heat Pump involves a modest learning curve for residents. Gradient recommends a “set it and forget it” approach, consistent with best practices for heat pump operation. Early deployment data suggests some residents continue to use the system like a traditional window AC, turning it off or unplugging it when leaving the room, which reduces efficiency. Gradient is expanding tenant education efforts to encourage more effective, energy-efficient usage.

For building management, training and adoption are relatively straightforward. Installation is simple, typically completed in under an hour, and routine maintenance takes about 10 minutes per unit. Staff at early deployment sites have reported spending significantly less time on maintenance compared to legacy systems such as steam radiators.

Gradient trains technicians to maintain systems; maintanance is similar to mini-split maintanance.

Units come with a 5-year standard warranty: first year covers parts and labor, and the following four years covers parts. Additional repairs can be done by a qualified Gradient technician.

Gradient’s NEXUS platform is a building wide fleet management tool for multifamily owners and operators, housing authorities, campuses, and organizations; features include:

• Smart Set Point Guardrails

• Personalized Tenant Comfort

• Lower Downtime with Proactive MaintenanceWeather & Usage based Load Forecasting

• Demand Response Integration

Factory-sealed low GWP R-32 refrigerant design reduces leakage by 89-95%, unlike traditional HVAC systems.

Gradient’s window heat pump enhances building resilience by enabling a transition to fully electric heating and cooling, helping mitigate climate impacts. Its design supports more flexible energy use, allowing buildings to better adapt to changing grid conditions and increasing electrification. As the grid evolves, this flexibility becomes critical. Nexus, Gradient’s building management platform, builds on this by enabling demand response, helping shift energy use away from peak periods and further protecting residents from grid strain and outages.

UL 60335-1; UL 60335-2-40; DOE CFR; ENERGY STAR Version 5.0; ENERGY STAR Most Efficient 2025; CEE Advanced Tier Certification

Technical Specs