Inverter Ducted Split Heat Pump System Review. Mike Holmes Blog
Inverter Ducted Split Heat Pump System Review. Mike Holmes Blog

DUCTED HEAT PUMPS: Bosch Inverter Ducted Split System Review

By Mike Holmes

Mike’s Advice / Home Renovation

Wednesday, November 1st, 2023 @ 2:25pm

What You Need to Know About Ducted Heat Pump HVAC Systems

Heat pumps are an energy-efficient alternative to furnaces and air conditioners and can be used anywhere. They use electricity to transfer heat from a cool space to a warm space. So in the summer, it transfers heat from inside your home outdoors making your home cooler. In the winter the opposite happens, heat is transferred from outside indoors, making your home warmer. An inverter ducted split (IDS) system, is a type of ducted heat pump, powered by either electricity or a gas air handler. It distributes heat and cooling through ductwork connected to vents in each room. 

Now I believe that some jobs are best left to the pros. Since I’m not an HVAC tech expert, I spoke to the real experts at Bosch about IDS heat pump systems. Here’s a guide on inverted ducted split HVAC systems and what you need to know before buying one.


What Is a Ducted Heat Pump System?

Let’s start with the basics. An inverted ducted split HVAC system is a heating and cooling system where there is no continuous cycling of “on” and “off”. Instead, the system has a long and slow running time and maintains the thermostat setting in real-time. It doesn’t mean the system is slow to bring your home to the desired temperature, but this type of split inverter over a rotary compressor is more efficient and uses far less energy.

In many split-system air conditioners, the indoor cabinet also contains a furnace or a heat exchanger of a heat pump. In addition, split systems are economical for homes with a furnace but no air conditioner, as they can utilize the same furnace ductwork to keep your home at a comfortable temperature all year round.



How Do Heat Pumps Work?

A ducted air conditioner is made up of two units: an interior unit that is normally positioned in the ceiling and an exterior unit. The two units collaborate to complete a refrigeration cycle, with conditioned air that circulates through a network of ducts and vents.

The inverter technology allows the compressor to adjust its speed and uses the right amount of refrigerant – which optimizes comfort, while keeping noise levels low, and uses less energy.


Heat pump illustration - How does a heat pump work?

Heat pump illustration – How does a heat pump work?



Heat Pump Systems: What You Need To Know


Step-by-step process of heating and cooling

A heat pump generates heat by collecting heat from the outside air and transferring it to a coolant. The coolant is compressed, causing its temperature to rise rapidly. The coolant is then moved to the indoor unit of the heat pump, where air is pushed over it by a fan to heat it to your chosen house temperature.

During the summer, a refrigerant is used by your heat pump in cooling mode to take warm air from within your home and release it into the air outside.


How Inverter Ducted Split System Differs from Traditional HVAC Systems

A ducted AC system uses ductwork in the walls and ceiling to provide only air conditioning throughout the home. However, an inverter ducted split heat pump can also provide heating and is typically powered by electricity. 

The main difference is in the compressor. In a standard air conditioner, the compressor operates until it reaches the desired or set temperature, then shuts off.  It starts up again when the room gets warm, and the cool-down process starts again. This means homeowners can experience more fluctuations in the temperature throughout the day. It also uses more energy as the cooling cycle starts all over again every time the temperature drops —which means higher energy bills.

With an IDS heat pump, when an inverter is used and the room reaches its desired or set temperature, the compressor slows down so the room temperature remains constant. This means the motor doesn’t have to work as hard, it’s more energy-efficient, and quieter. 


Energy efficiency comparison

IDS heat pumps are far more efficient than traditional central air conditioners, in fact, they can be up to 30-40% more efficient.
A lot of energy is wasted using traditional HVAC systems with constant “on” and “off”. Inverted heat pumps only use the energy they require, not the energy they consume while cycling, which means they provide maximum comfort while using minimal energy usage.


What is the Difference Between Ducted And Ductless Heat Pumps?

Traditional ducted units use a single outside unit and a network of ducts to distribute conditioned air throughout your house. 

Ductless heat pumps, also known as mini-splits, use air handlers installed inside your home to heat and cool a specific space. Mini-splits also take up less room in your home than central air conditioners and are simpler to install and maintain. However, they’re meant for smaller spaces like a sunroom, bedroom, etc. —but can’t heat or cool an entire house with just one unit.



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Key Components of Ducted Heat Pumps

Outdoor Unit (condenser)

  1. Compressor
  2. Heat Exchanger
  3. Fan


Bosch Heat Pump Outdoor Unit

Bosch Heat Pump Outdoor Unit installed in Frank’s house in Holmes Family Rescue Season 1.


Indoor Unit (evaporator) of Inverter Ducted Split System Heat Pump

  1. Blower Fan
  2. Heat Exchanger
  3. Air Filter


Bosch Inverter Ducted System (IDS) showing condenser and handler.

Inverter Ducted System (IDS) showing condenser and handler.


What Is The Best Heat Pump On The Market?

We’ve installed the Bosch Inverter Ducted Split Air Source Heat Pump system on many of our projects. What I love about it is that it uses the correct amount of energy for optimal efficiency, which means more savings on your utility bills. It’s also super quiet, 59 decibels. 



When I choose products I like to go for the best, simply because this is a big investment you’re making and you want it to have top performance and last for a long time. The Bosch heat pumps and IDS family are synonymous with top-notch engineering, whisper-quiet operation, and an unparalleled warranty that provides outstanding home comfort.


Bosch IDS Light Heat Pump

The Bosch IDS Light heat pump is easy to install and is compatible with existing systems, for example, if you need to replace your outdoor unit, this unit can easily be incorporated into your existing heating and cooling system.

The new IDS Light is an inverter-driven heat pump that self-adjusts, offering optimal comfort and room temperature. The faster compressor speed and modulating inverter system provide the right amount of hot or cool needed to reach the desired temperature. 

The Bosch BOVA15’s high-efficiency variable capacity inverter compressor can adjust to any speed between 33% and 110% (in 1% increments) to perfectly cool and heat your home while using the least amount of energy for optimal comfort. 



Here’s another great feature. The condensing units come with an electronic expansion valve (EEV) to ensure proper refrigerant flow and efficiency under all conditions. The direct-drive fan blades help reduce the noise level of the unit to as low as 59 dBA. That’s really quiet.

Also, the Bosch IDS Light uses Bosch’s BVA15 air handler to reduce energy loss and condensation. When compared to normal copper coils, the aluminum coil delivers great heat transfer, efficiency, and humidity removal, with improved durability and a lesser possibility of refrigerant leakage. The IDS Light outdoor unit comes in 24k, 36k, and 60k BTU capacities.


Advantages of Ducted Heat Pumps

Heat pumps both heat and cool your home all in one. They are durable, and efficient, saving up to 50% on your heating bills. Plus, they are very quiet compared to traditional HVAC systems.

  1. Saves money on energy bills
  2. Cools area down faster
  3. Less noisy
  4. Lasts longer
  5. Better for the environment



How Quiet Heat Pumps Can Create a Bang for Your Business


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Energy Efficiency and Cost Savings of Heat Pumps

Inverter technology is more energy efficient than a non-inverter model. Why? Because they can adjust their power consumption based on the outside temperature or the number of people occupying your home at any given time. 

Modulating inverter systems simply deliver the amount of hot or cold air required to reach the target temperature – nothing more, nothing less. The power is regulated by a sensor and the set room temperature which results in less energy usage and better efficiency. An inverter can save up to 20 -40% less power than a non-inverter AC. However, the up-front costs may be more initially, but there is long-term savings.



5 Ways to Improve Your Home’s Energy Efficiency


Performance and Comfort of Inverter Ducted Split System

Precise temperature control and maintaining setpoints

Bosch’s Inverter systems’ increased compressor speed allows for a faster and more efficient cooldown or warming. Even when the outside temperature falls below freezing, inverter-driven heat pumps will self-adjust to maintain a constant interior temperature. 

Traditional systems take a while to reach a comfortable temperature, while the increased compressor speeds of the inverter system enable quicker, smoother, and more effective heating and cooling. 


Low noise levels and quiet operation

The Bosch Inverter Ducted Split system is one of the quietest air-to-air heat pumps on the market. The Bosch IDS Light 15-Seer is super quiet – 59 dGB. It’s so quiet that your neighbours won’t hear your unit go on or off.  

It uses silent blade technology, sound isolating mounts, and an outdoor condensing section placement. I like that! 


User interface and control options

Bosch heat pumps can be used with almost every Wi-Fi and basic thermostat on the market today and can be controlled using the Bosch Connected Control app.


Mike Checks the Smart Thermostat

smart thermostat can help save you money on your monthly bills.


Limitations or potential drawbacks to consider

 A ducted system may only be suitable if your home has enough space for the central unit. Due to the system’s complexity, installation can take longer to complete, and the initial cost of a ducted heat pump is higher. 

Still, in the long run, you will find savings from the unit’s efficiency compared to other heat sources.


Installing A Heat Pump

Ease of installation and compatibility with existing systems

The IDS Light is easy to install, it’s a non-communicating indoor and outdoor unit. But the great thing is it’s compatible with existing systems. For example, if you need to replace your outdoor unit, this unit can easily be incorporated into your existing heating and cooling system.



Indoor and outdoor unit placement options

Heat pumps should be at least 1 meter (or approximately 3 ft) from a boundary wall, a bedroom window, or any opening doors. Most heat pumps require a solid base or suspended on a platform to ensure there is enough room around them to allow for good airflow. 

You should not install a heat pump in a shed.

Air-source heat pumps can be installed inside, but they must be ducted —drawing in fresh air from the outside through a duct and also exhaling fresh air to the outside through a duct. This helps ensure that they have access to all the fresh air they require.


Finding a certified HVAC technician

HVAC installation is a complicated process and needs to be done by a licensed professional. A licensed professional technician will assess your current circumstances, provide the best solution, and do the job correctly and safely. HVAC installation is NOT a DIY job. 


Find a Bosch Trained and Certified Technician here.


Bosch IDS Heat Pump Installed on Mike Holmes Project. Holmes Family Rescue.

HVAC installation is a complicated process and needs to be done by a licensed professional.



Nine Jobs To Leave To The Pros


Maintenance Requirements

At the beginning of each heating and cooling season, the following checks need to occur:

  • Turn off the unit and disconnect the power
  • Check for damaged wires
  • Check for leaks
  • Make sure there is nothing blocking all air inlets and outlets and clean the coils as necessary


It’s also essential that any heat pump maintenance and cleaning of the outdoor unit is performed by a qualified service technician. 

Keep the area surrounding the unit clear, never use any chemicals or solvents to clean the unit, and always turn off your heat pump and disconnect the power supply before cleaning or servicing.


Maintaining Bosch IDS System

A heat pump requires a service call by a skilled maintenance professional at least once a year. During the service, the technician will need to examine a variety of things,  including temperature pressure, and inspect ducts, filters, blower, and indoor coil for dirt and other obstructions. 



Guide to Heat Pump and Furnace Maintenance: Tips to Keep Your System Running Smoothly


Considerations before Buying

Always work with a qualified licensed technician and I’d go a step further and ensure they are a brand/manufacturer certified. This added bonus means they have been specially trained by the manufacturer and understand all the intricate details of the equipment – it also typically means there are additional warranties too.



Size and capacity requirements for your space

The Bosch Inverter Ducted Split Family Heat Pumps are available in four different sizes, with capacities ranging from two to five tons. There are three systems from which to choose, and a certified technician can help you find the right sized unit based on your home’s size and needs


Find a Bosch Trained and Certified Technician here.


15 SEER IDS Light System

  • The market’s first-ever 15 SEER unitary inverter system
  • Delivers quality engineering at an affordable price if you don’t need a higher SEER.
  • 15 SEER inverter system, the highly reliable BOVB18 outdoor unit is partnered with the new BVA15 PFC indoor air handler.
  • Delivers all the benefits of an inverter system at an exceptionally affordable price.


18 SEER IDS Light System

  • Affordability, efficiency and comfort
  • BOVB18 outdoor unit with the unrivaled BVA20 two-stage x13 ECM-style indoor air handler for optimal heating and cooling performance.


20 SEER IDS Light System

  • Combines the robust BOVA20 outdoor unit with the second-to-none BVA20 two-stage constant torque ECM air handler
  • The system qualifies for maximum energy rebates and delivers peak cost savings.


Energy efficiency ratings and certifications

Traditional units frequently turning on and off create an in-rush current surge that uses more energy and puts unnecessary strain on your system. The Bosch inverter system ramps up operations gradually to prevent energy usage spikes and prolong system life. 


Cost and budget considerations

Like most things, heat pumps can vary in price and performance, so its essential that you do your homework when considering one. Most brands cost between $2,500 to $10,000  to install, and the average cost is typically around $5,500. 

If your home lacks ductwork or you choose a geothermal or solar-powered heat pump, installation prices can soar substantially higher – up to $30,000. 


To help homeowners, there are government grants and subsidies that can help with the upgrades so be sure to check out your local options. Find out more here.


Available features and add-ons

Consider a heat pump with a scroll compressor, variable-speed blower, water heating options, and a Wi-Fi thermostat to maintain your home’s ideal temperature while consuming less energy.

Other features include intelligent defrosting, humidity control, and air filtration systems. These supplementary features can improve the comfort of your home while increasing the efficiency of your heat pump system. Considerations like noise level, warranty coverage, and installation costs are also important.

A forced air furnace, whether new or old, can have an add-on heat pump, often known as a ducted inverter split system.



Compatibility with smart home systems

The IDS Premium Connected offers a wireless Internet of Things (IoT) platform for contractors and homeowners, as well as in-app warranty registration, installation, and troubleshooting. 

Smart home features include remote monitoring that allows for the monitoring of data for a unit even in the absence of a communicating thermostat by contractors and homeowners. This is great because you can control your home’s temperature even while you’re on vacation to make sure there are no major fluctuations that can affect your home.

Plus for contractors, there’s the added bonus of using the Bosch EasyAir App to quickly and simply get the data they require to perform on-site installation, troubleshooting, and warranty registration. 



A Complete Guide To Building A Smart Home


Warranty coverage and customer support

Bosch’s comprehensive residential limited warranty covers parts for ten years. When the heat pump was manufactured, the usual warranty covered all components. All other heat pump components ordered and installed in the field by Bosch are covered by a one-year parts guarantee.


mike holmes protection plan

A home protection plan is a smart investment to protect the major systems of your house, such as heating and cooling, appliances, etc. Check out the Mike Holmes Protection Plan packages!


A lot of energy is wasted when traditional HVAC systems turn on and off. However, inverter-driven heat pumps only use the energy they require, not the energy they consume while cycling. Inverter ducted split systems, made possible by the compressor technology, offer maximum comfort without breaking the bank. And that’s Making It Right!



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