Hello Guest Login!

Featured Products

High Velocity Help

First of all, if you know what equipment you already need click a brand logo below:

Otherwise, read on, or contact us now for free help and engineering.  It doesn't matter where you live.  We do remote system engineering in our office for systems in ALL states in the USA and also all countries outside the USA.  As long as you get us detailed drawings/plans/blueprints and our engineering request form filled out, we can do all the engineering right in our office without needing to do an on-site visit.  We have done them this way for over 20 years now, so we are excellent at it.  Then, we ship the equipment to your job-site and you or your installation crew can install the components.

Have immediate questions? Click the live chat button on the bottom right side of the page now to chat with one of our high velocity specialists.

more efficient ?!
Did you know that high velocity AC systems are actually more efficient than conventional systems?  Don't be confused by the DOE efficiency ratings for high velocity systems.  They are irrelevant.  Those tests are designed for conventional systems with conventional airflow.  When testing a high velocity system using conventional system methods the resulting efficiency rating is not an accurate measure of the system's efficiency.  This is because the airflow in a high velocity system is very different than a conventional system.

Here is a look at what the actual efficiencies are of a conventional versus high velocity systems if you take actual installation site conditions into effect (duct air leakage into the building and thermal losses from duct work run in hot attics)  If we put a 13 SEER condenser on both systems, how efficient are they? How much energy is actually delivered to the building? What do you actually get?

We will compare a conventional low velocity ducted system to a small duct high velocity system matched to the same outdoor condensing unit.  For this example, the outdoor condenser is a 5-ton and the duct work is installed in the attic. The building heat load is 40,000 BTUH.

Small Duct High Velocity System:

The system is rated at 49,000 Btu/hr at 11 SEER. Small duct efficiency is 85%. The equipment load is 47,000 Btu/hr (= 40,000 ÷ 0.85).
Again, this is smaller than the equipment capacity so the run time would only be 96% of the time (= 47000 ÷ 49000). 
The system power usage is 4276 Watts per hour (= 49000 ÷ 11 × 0.96).

Conventional System:
The equipment is rated at 57,000 Btu/hr and 13 SEER. The duct efficiency is 70%.The required equipment load is actually higher because of the duct leakage and thermal losses. It is 57,150 Btu/hr (= 40,000 divided by 0.70). This is close enough to the actual equipment capacity. The power usage is 4385 Watts per hour (= 57,000 divided by 13.00).

The Small Duct High Velocity system is more efficient! Plus, if the ducts are inside the conditioned space, you can downsize the condenser and save even more, up to 20%.

tried & trued
SpacePak and Hi-Velocity Mini-Duct(2 inch) High Velocity cooling and heating systems are our specialty here and have been for over 20 years.  So, trust us to quickly and accurately design your new high velocity system for you.  Most of our clients are surprised to learn this technology has been around since the 1970's and only recently found out about it by watching "This Old House".  These systems are finally getting the publicity they deserve since they outshine conventional systems in many ways. In this picture on the right is one of the insulated 2" supply tubes with the white outlet attached, soon to be flush in the ceiling.


They are easier to install than conventional in both classic homes with no previous AC as well as new construction.  We have had countless end users doing self contracting tell us how surprised they were at the ease of installation.  These systems also are superior at humidity reduction pulling out 35% more moisture than conventional systems, so the air feels a lot more comfortable.  The biggest benefit is that from floor to ceiling and room to room the temperatures are equal.  We can also design your system to have up to 4 zones in case you want different areas at different temperatures.  There are a few different types of systems we can do with SpacePak and Hi-Velocity.  Here are some examples:

  • Cooling Only with a conventional outdoor AC condenser
  • Cooling Only using an air cooled water chiller
  • Cooling Only using a geothermal heat pump
  • Heating Only using electric heat module
  • Heating Only using a gas, oil, or wood fired water boiler
  • Heating Only using a conventional heat pump (with or without back-up electric heat)
  • Heating Only using a reverse cycle heat pump chiller
  • Heating Only using a geothermal heat pump
  • Cooling and Heating using a conventional AC condenser and Electric Heat Module
  • Cooling and Heating using a conventional heat pump with optional back-up Electric Heat Module
  • Cooling and Heating using a reverse cycle heat pump chiller
  • Cooling and Heating using a geothermal heat pump
  • Cooling and Heating using a conventional AC condenser and Hot Water Heat provided by a gas, oil or wood fired water boiler.  Some of our clients already have a boiler for their radiant in-floor heating system.  Those systems are awesome, but they take awhile to warm up.  By adding a hot water coil on to your system, you can use your current(or new) boiler to provide fast forced air heat from the high velocity system too.

Which system is right for you?  Well the main differences are in the air handler types and the way connections are made in the system.  Both systems use the same size 2" supply tubing and 2" outlets(Hi-Velocity has an optional 3").  SpacePak systems can be zoned in to as many as 3 zones if desired and Hi-Velocity can be up to 4 zones(we have done up to 12 zones on Hi-Velocity using chilled water).  Both offer chilled/heated water versions of their air handlers for use with a chiller or geothermal system.  Both systems can use the optional slotted outlets.  If you are wanting to use zoning then definitely check out the Hi-Velocity brand with their easy to add on 2-4 zone kit and automatic real-time plenum pressure monitor and regulator.

spot cooling
Spot Cooling for industrial worker cooling can also be perfectly handled by either of these high velocity systems.  We can engineer out a spot cooling system that will keep your production line/station workers cool.  There's no need to waste money on cooling the entire building.  Instead, we strategically blow jets of high pressure cold air on each work station from 1 or 2 directions to keep workers cool and productive.

D.I.Y. ?
Do you have handy skills?  If you are thinking of doing any, or all of the high velocity system installation yourself, this is the perfect system for that.  These systems go together easily.  Parts are friendly to use.  We have helped countless self contractors and even home owners with their installation.  We do the engineering and then you just have to put the equipment in.  Do as much, or as little as you feel comfortable with.  Some of our customers do everything except the refrigeration connections and start-up, leaving that part to an AC technician to make sure the system is connected and sealed properly and the correct amount of refrigerant is in the system.  This is definitely a D.I.Y. AC system favorite.  If you get stumped during an installation we are here to help you with any issues that come up.  If it is beyond our expertise, then we can obtain help from the technicians at the factory as well.

SpacePak uses a single piece air handler and an ECM variable speed blower motor.  230 volts is stock, but they can be modified to use 115 volts instead.  SpacePak connections are all made using their kwik-connect twist and lock fittings.  SpacePak uses either a 10"x10" square fiberboard plenum, or a 9" round sheet metal for all sizes of their systems.  Optional electric duct heater, as well as optional hot water heat coil module.
Click Here To See Typical Square Plenum System Layout Of Pieces
Click Here To See Typical Round Sheet Metal Plenum Layout Of Pieces

Hi-Velocity is the only manufacturer to use an actual VFD (variable frequency drive) to variably control the blower motor speed.  They are also the only ones to have a plenum pressure sensor that automatically maintains the set plenum pressure, so that if a filter gets dirty, or if you use zoning the blower speed will change by itself to maintain proper pressures so it's not too low or too high.  They also have a fan only speed setting which can be turned down to a trickle of air, so that filtration and circulation is continuous at a low volume.

If you aren't interested in the VFD and pressure monitoring models, they do offer some standard 1-speed PSC motors as well.

Hi-Velocity has their own optional integral zoning system that attaches to the front of the air handler and includes the dampers and plenum collars, so it makes it very easy to zone in 2, 3, or 4 zones right at the air handler.  Working with their VFD and pressure sensors the airflow is monitored and the blower speed controlled to match the needs of however many zones are needing cooling or heating.

Hi-Velocity also has the most advanced optional air purification system available.  It features MERV 13 filters, Ultraviolet light purification with 0 ozone production, as well as a Titanium Honeycomb air purification module which never needs cleaning or replacing for removing odors and toxins in the air.

Hi-velocity doesn't manufacturer their own plenums, return air ducts, or return air/filter/grilles.  So, that leaves us free to use common off-the-shelf round sheet metal for plenums.  Regular insulated flex duct for return air ducts and standard size return air/filter/grille boxes.  This saves a lot of money on material.

Hi-Velocity offers a 3-ton and 5-ton inverter variable speed compressor heat pump, which when coupled with their VFD blower motors and/or zoning equipment will be able to offer unmatched comfort and energy savings with the ability to precisely control different areas of the building.  Also extremely popular is combining the Hi-Velocity VFD system along with the new Bosch BOVA series inverter variable speed heat pumps.  That offers excellent performance and energy savings plus the Bosch inverter heat pump is priced even lower than most brands of 2-speed equipment.  The Bosch inverter heat pump doesn't need special thermostats or controls.

get started now!!
The main things we need from you to get started on doing system engineering like the image above and determining what equipment you will need are a floor plan(hand drawn or CADD or Blue Prints) and to fill out our engineering form.  We will provide you with an equipment list and outlet per room guide and layout if desired.  Our engineer will do the heat load and/or heat loss calculations and custom design your SpacePak or Hi-Velocity high velocity AC system free of charge.  Then, we send you the equipment list that you would need for the project.  After we get the list to your liking, we can sell you the equipment and ship it to the job site.  We do it all here.  We just need the information on the list below, so that our engineer can to get to work for you! 

Click Here to view and submit the engineering form online, or download the pdf and print it out.  Gather the info on the list and get it back to us by email, fax, or snail mail.

If you need financing on your high velocity equipment, visit our friends at Movement Mortgage. [click here]