ACCA Approved
Manual J Services
Let us help you choose the right HVAC for your home
Services
Manual J
Simply stated a Manual J load calculation factors in the different characteristics of your home (such as square footage, position of your walls, building materials, etc.) to determine how much heating or cooling capacity your home needs. his one is for determining how much heat the house loses in winter and gains in summer. You do this room-by-room for the whole house, which allows you to determine how much conditioned air each room needs for both heating and cooling. It factors in all the surfaces of the building envelope, with their areas and insulation levels. Each wall is given its proper orientation, because windows and doors are attached to them. Other important data include the location and tightness of the duct system, the infiltration rate of the house, the internal loads (appliances and people), and where the house is located.
Manual S
Once you know the amount of conditioned air necessary in each room, you have to select the equipment. What air conditioner, heat pump, furnace, or boiler are you going to install? With forced air systems, this part is critical because every piece of equipment has different characteristics - sensible and latent capacities, the amount of air moved, and the static pressures being the key ones for the next stages. The process of selecting the right equipment for your home. The problem is that most HVAC contractors currently sidestep the Manual S procedure, relying instead on AHRI or nameplate capacity for equipment selection.
Manual D
Finally, once you know how many cubic feet per minute of conditioned air you need for each room, what equipment you're using, and how you're distributing the air in the room, you can design the duct system. Here you look at the location of the air handler, the distance to the ducts, how many turns the ducts have to make, and how much air needs to be delivered. The type of duct has a big impact on the results, as sheet metal ducts have a lower friction rate than flex duct or rigid fiberglass duct board.
Basically, with Manual D, you're trying to balance the delivery of the correct amount of air against the friction rate of the ducts and the static pressures in the system.
We’ll Show You How It’s Done
Achieving occupant satisfaction is the principal goal of any HVAC design. Primary factors impacting occupant satisfaction include: filtration, temperature and humidity control, air motion in the room, adequate ventilation, interior zoning needs and energy efficient operation. Occupant satisfaction is maximized when the heating and cooling system and equipment are the correct type and size and the air distribution system is properly designed and installed.
Under and Oversized Systems
An undersized or oversized air conditioner can have an impact on the comfort of your home. Undersized air conditioners never reach temperature settings, run constantly, dry out your air and may have a shorter life. An oversized air conditioner will go through a process known as “short-cycling.” When an air conditioner short cycles, it reaches your desired temperature too quickly. Sound like a good thing? Well, your air conditioner is responsible for more than just temperature. It is also responsible for removing enough humidity from your home’s air. When an air conditioner short cycles, it is not removing enough humidity, and an overabundance of humidity can make your home feel warm and encourage mold growth – yuck!
When your local contractor comes out to give you a quote, make sure they perform a Manual J load calculation before they determine your needed cooling capacity. If they say you don’t need one, this could be a red flag.
Success Stories
Very impressed with the advice and load calculations.
We were close to spending thousands of dollars on replacing our HVAC unit but we were able to find the right contractor to do a Manual J for us.
Fantastic company to deal with the staff were very helpful with designing our Duct system.
Let’s Get Started
Ready To Choose The Right HVAC For Your Home or Clients