Harvest Thermal Battery

The Smart Way to Store Energy at Home

Harvest Thermal has developed a breakthrough in home energy management: a thermal battery that integrates directly with your heat pump system. Instead of relying on expensive lithium-ion batteries to store electricity, the Harvest Thermal Battery stores energy as heat in a large, insulated hot water tank — a far more affordable and efficient approach to home energy storage.

The system works by running your heat pump during off-peak electricity hours, when rates are lowest, to heat a large water tank to high temperatures. That stored thermal energy is then used throughout the day for space heating, domestic hot water, and even to assist with cooling — all without drawing expensive electricity during peak rate periods. The result is significant savings on your monthly utility bills.

As an authorized Harvest Thermal installer, Allison Air Comfort Solutions provides expert design, installation, and configuration of the complete Harvest system. We ensure seamless integration with your existing or new heat pump, optimize the system for your home's specific needs, and set up the intelligent controls that maximize your energy savings from day one.

Why Choose Harvest Thermal?

Harvest Thermal brings smart energy storage to your home, turning your heat pump into a money-saving, grid-friendly powerhouse.

Savings

Lower Your Electricity Bills

The Harvest Thermal Battery shifts your heat pump's energy consumption to off-peak hours when electricity rates are lowest. On time-of-use rate plans, this can reduce your heating and hot water costs by 40–60%. The system pays for itself through monthly utility savings, often in just a few years.

Smart Controls

Intelligent Energy Management

Harvest's cloud-connected controller automatically learns your utility rate schedule, weather forecasts, and household usage patterns. It decides exactly when to charge and discharge the thermal battery for maximum savings — no manual intervention required. You simply set your comfort preferences and let the system optimize everything else.

Integration

Seamless Heat Pump Integration

The Harvest Thermal Battery is designed to work alongside standard heat pump systems. It doesn't replace your heat pump — it makes it smarter. The system manages when and how your heat pump operates, ensuring your home stays comfortable while avoiding expensive peak-rate electricity consumption.

Clean Energy

Supports a Cleaner Grid

By shifting energy use to off-peak hours, Harvest Thermal helps reduce strain on the electrical grid during high-demand periods. Off-peak electricity is also typically generated from cleaner sources, so running your heat pump at night means a lower carbon footprint for your household.

Hot Water

Domestic Hot Water Included

The Harvest Thermal Battery doubles as a high-capacity water heater. The stored thermal energy provides abundant domestic hot water for your entire household, eliminating the need for a separate water heater and further reducing your energy costs and equipment footprint.

Reliability

Simple, Proven Technology

Unlike chemical batteries that degrade over time, the Harvest Thermal Battery stores energy as hot water in a well-insulated tank — a fundamentally simple and durable approach. There are no rare earth minerals, no fire risk, and no capacity degradation. The system is built to last the lifetime of your home.

How the Harvest System Works

A simple, intelligent cycle of charging and discharging thermal energy to keep your home comfortable and your bills low.

Step 1 — Charge During Off-Peak Hours

During overnight and off-peak electricity hours, when rates are at their lowest, the Harvest controller activates your heat pump to heat the large, insulated water tank to high temperatures. This "charges" the thermal battery with stored energy, ready to be used when electricity prices spike.

Heat pump runs during cheapest electricity hours
Water tank heated to optimal storage temperature
Heavily insulated tank retains heat for hours
Automatic scheduling based on your utility rate plan
Weather-aware forecasting optimizes charge level

Step 2 — Discharge During Peak Hours

When electricity rates rise during peak daytime and evening hours, the Harvest system draws stored thermal energy from the hot water tank instead of running the heat pump on expensive electricity. This stored heat is circulated through your home for space heating or delivered as domestic hot water.

Stored heat provides space heating without running the heat pump
Domestic hot water supplied from the thermal battery
Heat pump stays off or runs minimally during peak rates
Seamless comfort with no interruption to your routine
Real-time monitoring via the Harvest app

Step 3 — Cooling & Year-Round Optimization

In cooling season, the Harvest system pre-cools your home during off-peak hours and optimizes heat pump operation to minimize peak electricity usage. The intelligent controller continuously adapts to seasons, weather, rate changes, and your household patterns to maximize savings year-round.

Pre-cooling strategy shifts AC load to off-peak hours
Year-round optimization for heating, cooling, and hot water
Continuous learning adapts to your household's patterns
Over-the-air updates add new features and improvements
Compatible with solar PV for even greater savings

Benefits of Thermal Energy Storage

The Harvest Thermal Battery represents a fundamentally different approach to home energy storage. Instead of storing electricity in chemical batteries, it stores energy as heat — a method that is more affordable, more durable, and perfectly suited for HVAC and hot water applications.

Key Benefits for Homeowners

Time-of-use rate optimization: Automatically shifts energy consumption to the cheapest hours, saving 40–60% on heating and hot water costs
Lower upfront cost than lithium batteries: Thermal storage costs a fraction of equivalent chemical battery capacity for heating and hot water applications
No capacity degradation: Unlike lithium-ion batteries that lose capacity over time, a hot water tank maintains its storage capacity indefinitely
Domestic hot water included: Replaces your existing water heater, providing abundant hot water as part of the system
Grid-friendly operation: Reduces peak demand on the electrical grid, supporting grid stability and cleaner energy generation
Solar synergy: Pairs perfectly with rooftop solar panels — store excess solar energy as heat during the day, use it at night
Rebate eligible: Qualifies for federal tax credits, TECH Clean California incentives, and Bay Area utility rebates
Smart and connected: Cloud-based controller with app monitoring, automatic rate optimization, and over-the-air software updates

Harvest Thermal System Comparison

See how the Harvest Thermal Battery compares to other home energy storage approaches for heating, cooling, and hot water.

Feature	Harvest Thermal Battery	Lithium-Ion Battery (e.g., Powerwall)	Standard Heat Pump (No Storage)	Gas Furnace + Tank Water Heater
Energy Storage Type	Thermal (hot water)	Electrochemical (lithium-ion)	None	None
Time-of-Use Optimization	Yes — automatic	Yes — automatic	No	No
Space Heating	Yes — from stored heat	Indirect (powers heat pump)	Yes — real-time only	Yes — gas combustion
Domestic Hot Water	Yes — integrated	No — separate heater needed	No — separate heater needed	Yes — separate gas tank
Cooling Support	Yes — pre-cooling strategy	Yes — powers AC	Yes — real-time only	Separate AC required
Capacity Degradation	None	Loses ~2–3% per year	N/A	N/A
Estimated Bill Savings	40–60% on heating & hot water	20–40% on total electricity	Baseline	Higher gas & electric costs
Smart Controls	Cloud-connected, app, auto-scheduling	App-based monitoring	Standard thermostat	Standard thermostat
Best For	TOU rate optimization, whole-home comfort	Whole-home backup power	Basic heating & cooling	Legacy systems

Professionally Installed by Allison Air

The Harvest Thermal Battery is a sophisticated system that requires expert installation and configuration to deliver its full potential. Allison Air Comfort Solutions provides complete turnkey installation, including system design, equipment placement, heat pump integration, plumbing connections, electrical work, and commissioning of the smart controls.

Our team works directly with Harvest Thermal's engineering support to ensure every installation meets their specifications and is optimized for your home's layout, insulation, ductwork, and local utility rate schedule. After installation, we walk you through the Harvest app, verify system performance, and provide ongoing maintenance support.

Harvest Thermal Battery system installed in attic