Harvest Thermal Battery
Smart thermal energy storage that works with your heat pump to save money, reduce peak energy demand, and deliver whole-home comfort around the clock.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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
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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
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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 |
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| 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.
Ready to Save with Harvest Thermal?
Contact Allison Air Comfort Solutions for a free consultation on Harvest Thermal Battery installation and start saving on your energy bills.