Q &.A Heat pump

Posted by Sylvain 27/12/2016 8 Comment(s)

 

Many people are wondering about heat pumps. How does it work? What is the cost of a heat pump? How do I install a heat pump? In this article, we will attempt to answer the questions most frequently asked to us.

 

 

What is the price of a central heat pump?


The price of a heat pump depends on several factors. The main factors influencing the price of a heat pump are: tonnage, energy efficiency, technology, and the characteristics of the installation. For example, a central heat pump of 24 000 BTUs (2 tons) cost less than a 60,000 BTU's heat pump (5 tons). The same logic applies to the require level of energy efficiency of the unit. The price of a central heat pump will be higher for a device displaying a 20 SEER rating compared to a device displaying a 14 SEER rating. If the central heat pump uses an inverter type compressor (variable speed), the price will be higher than for the system operating with a standard compressor. The price of a central heat pump is normally in the range of $4000 to $7000 plus tax depending on the size and energy efficiency requirement. A home visit is required to estimate the proper size. This type of estimate is always free.

 

 

How do we install a central heat pump?

 

The installation of a central heat pump will take between 4 to 6 hours depending of the complexity of the installation and if it's a replacement or a new installation. The installation is performed by a team of two technicians. The installation of your central heat pump included the dismantling and disposal of your old heat pump (always included in the price) . The outdoor unit (condenser) will be placed on a wall mounted or floor rack. We will install a new set of refrigerant lines and a new evaporator (coil installed in the furnace). We take care of the electrical connection. The installation of your central heat pump will be fully functional on the same day.

 

 

How does a central heat pump work?


A central heat pump is a system that transfers heat from one space to another using a coolant. When refrigerant is evaporated (subject to a lower pressure), it absorbs ambient heat. When on the contrary it is condensed, it releases the heat it absorbed in. So during cooling, refrigerant is evaporated at low pressure in the indoor coil where it absorbs ambient heat and then be condensed at high pressure into the outdoor coil where it will release its heat. The central heat pump thus takes heat from the inside to remove him to the outside, in the air conditioning period. This is the same principle as a refrigerator. This heat transfer is made possible using the circulation of refrigerant between the two coils. During the heating season, the flow of refrigerant from the central heat pump will be reversed. The heat pump therefore take heat from the outside to evacuate inside. As unbelievable as it sounds, even when the air is cold, it contains energy. A heat pump always consists of an external condenser, an internal evaporator and copper lines connecting the condenser and the evaporator. The evaporator will be installed in a furnace (usually in the basement) or in a ventilator in the attic. To install a central heat pump, you must have ventilation ducts. The heat or cold produced by the heat pump will then be distributed in the house through the furnace fan and the ventilation ducts. The capacity of a heat pump is expressed in Btu and in tons. A Btu is the unit of measurement used to measure the heat output of a heating system. One tonne is 12,000 Btu

 

 

What is the energy efficiency of a heat pump?

 

The greatest benefit of using heat pumps is their energy efficiency. The energy efficiency of the heat pump is derived from its coefficient of performance (CP). At 10ºC, heat pumps, in general, have a CP of 3.3, which means concretely that for each kW / h of electricity they consume, they will produce 3.3 kW / H of heat. The heat pump produces more than what it consumes in electricity. This coefficient decreases as the temperature decreases as it is more difficult to recover the heat from the cold air. At -8.3ºC the CP is 2.3. When the equilibrium point is exceeded (point where another heating source is at the same cost as that of the heat pump), it becomes more economical to heat by means of the alternative heating source.

 

If you heat only electrically, your heat pump will reduce your heating bill by 30% to 50%. If you heat only with oil or natural gas, the heat pump will also save you 30% to 50% off your heating cost *. In addition, by being in dual energy (two sources of different heating, one with fossil energy), you will be entitled to Hydro-Québec's dual energy rate. In Montreal, the heating period lasts several months. Instead of your oil furnace working, it will be your heat pump that will run to around -12ºC. Then the furnace takes over. Calculate the number of days your furnace worked when the temperature is above -12ºC degrees celsius? Do you like to enrich the oil companies? In addition to saving $, you will reduce your ecological footprint and help reduce greenhouse gas emissions.

 

* The cost savings of heating depends on a number of factors such as: the HSPF rating of the heat pump, the prevailing climate conditions and the home specifications (insulation, heating preferences of the customer, etc).

 

Central or ductless?  

 

We say that a heat pump is central when it is installed on a heating and cooling system distributing heat or air conditioning through ventilation ducts located in every room of the house. The system will be equipped with a forced air furnace (electric, oil or gas). A heat pump is considered ductless when the heat or cooling is distributed through a diffuser that is wall mounted. There is therefore absence of ventilation ducts. This type of installation is often used for condominiums or apartments. The ductless heat pump is very popular for single-family homes that lack ventilation ducts . The price of a ductless heat pump is generally lower than that of a central.

 

 

What is SEER and HSPF?

 

  When we speak of energy efficiency for a central heat pump, you must linger in 2 key ratios: SEER and HSPF. The SEER rating stands for: Seasonal Energy Efficiency Ratio. This ratio assesses the energy efficiency of the central heat pump in air conditioning mode. The higher the rating, the greater the system is efficient and consumes little energy to produce air conditioning. The HSPF rating stands for: Heating Seasonal Performance Factor. This ratio assesses the energy efficiency of the unit in heating mode. The higher the rating, the higher the system is able to produce heating by using less energy. Obviously, energy efficiency has a price. The installation of a high efficiency central heat pump will cost more than a device with lower efficiency. However, with the steady increase in the cost of energy, it is more profitable to install a system with high energy efficiency.

 

 

1 stage, 2 stages or Inverter compressor?  

 

How to differentiate them? The compressor is the heart of a central heat pump. Depending on the type of compressor installed, the heart will function differently. In the case of 1 stage compressor, when the heat pump is running, it runs at 100% capacity, consuming thereby maximum energy. The 2 stages compressor has the particularity of being able to operate at 2 levels of capacity: about 67% or 100% capacity. When operating at 67% capacity, the compressor uses less electricity. The heat pump is then in ''maintenance'' mode. It only maintain the required temperature while putting down regime. In the case of a Inverter compressor, it has the particularity to modulate its functioning as a variable light (dimmer). The operating range of an inverter compressor is from 30% to 100% of its capacity. The compressor modulate is operation according to demand. Power consumption is reduced at low speeds. Systems equipped with two stages or inverter compressor can be confusing for consumers who have been accustomed to the stop-start cycle of a conventional device. When the heat pump is in low speed, it works longer than a standard heat pump. Although it works longer, it is more energy efficient than a standard heat pump because the power consumption is at low regime instead of full capacity.

 

 

 



Explanation of a Inverter compressor:



Just don't buy a price, do business with a reliable entrepreneur (in french, from the OPC)

 

 

 

 

 

8 Comment(s)

Rosanna:
01/12/2017, 04:07:13 PM
Reply

Since I started heating, in the last month or so, when the heating is on, the thermostat turns red and sometimes the air coming out of the vent is warm, which makes me suspect that it's not the heat pump but the furnace supplying the heat. This happens even when the outside temperature is above zero. How do I know if I have a problem with the heat pump, which, btw, is less then three years old?

Thermopompe N & R Sol:
14/02/2018, 03:54:12 PM

Please call our office so a customer attendant can help you out.

Lee Blanchette:
03/02/2018, 08:44:04 PM
Reply

How munch watts does a system take

Thermopompe N & R Sol:
14/02/2018, 04:03:46 PM

It depends on which system you install. Not all equipment as the same energetic consumption. An electric furnace of 15 Kw wont have the same energetic consumption than a 20 Kw electric furnace. Communicate with us directly if you have the specifics of the system you are looking for.

ALEX STAVRO:
04/03/2018, 08:28:14 PM
Reply

Heat Pump is covered in ice. The fans can still turn but the unit is covered in ice inside and out. What can we do?

Thermopompe N & R Sol:
07/03/2018, 09:48:58 AM

The presence of ice inside and outside the heat pump is not normal. There is numerous source for this type of problem and we highly recommend that you get the system inspect by a certified technician. Meanwhile, put your thermostat on emergency heat (if you have a central system). Your furnace will kick in and provide you heating. Shutdown the heat pump by closing either the breaker in the electrical panel or in the disconnect box outside near the heat pump. You can simply let the ice melt or you can give a little hand by putting hot water over the ice. You can do this for the coil. Do not put water directly on the service panel.

Murray:
30/04/2018, 11:41:48 AM
Reply

We have a Venstar thermostat. Does the thermostat ever have a readout that mentions “defrost”? If our readout mentions “heating” or “secondary heating” should the outside unit be on?

Thermopompe N & R Sol:
03/05/2018, 05:00:36 PM

The Venstar thermostat does not have a "defrost" readout. If the readout mentions "heating", the outside unit of the heat pump should be on. If the readout is "secondary heating" and you have a gas or oil furnace, the outside unit will be off or could be doing his defrost cycle. If your heat pump is paired with an electric furnace, depending on how the system was setup, both unit could be on at the same time.

Paul:
31/05/2018, 08:13:34 PM
Reply

My a/c doesn't seem to be working. Our thermopump make is an A32 140-241 it is 7 years old.

Thermopompe N & R Sol:
06/06/2018, 01:15:17 PM

Hello Paul. Please communicate with our service department at 450-699-3232.

Sylvain St-Pierre:
10/11/2018, 08:59:44 AM
Reply

Ma thermopompe fournis la chaleur demandé,mais elle givre,au complet,le cycle de dégivrage s effectue bien,mais sa ne dégivre pas.l An passer j ai fait ajouter du fréon, alors je ne crois pas qu il en manque encore. esce que je dois continuer de faire fonctionner ma thermopompe ou bien l arrêter. Et si je la fait fonctionner esce dangereux que la thermo pompe brûle. Qu en penser vous

Thermopompe N & R Sol:
12/11/2018, 09:59:25 AM

Bonjour Monsieur St-Pierre. La présence constante de givre n'est pas normal. Nous vous conseillons fortement d'éteindre votre appareil et de la faire vérifier par un technicien de service dûment formé. Les températures extérieures n'étant pas encore très froide, il se peut que vous manquiez encore de fréon et que votre thermopompe parvienne tout de même à fournir. Le givre peut abîmer les ailettes du serpentin ou même causer des dommages irréversibles au serpentin.

Mathieu Gingras:
23/02/2019, 10:54:21 AM
Reply

Quelqu'un peut me dire si la marque comfortmaker 5T comme thermopompe ainsi que la fournaise électrique sont à conseiller et installation pour 10000$ est un bon rapport qualité prix, merci.

Thermopompe N & R Sol:
25/02/2019, 02:37:30 PM

Bonjour monsieur Gingras. Comme nous ne distribuons pas cette marque dans notre gamme de produits, il serait plutôt hasardeux pour nous d'émettre une opinion sur la qualité de celle-ci. Vous conviendrez que nous pourrions facilement être jugé comme étant biaisé. Pour évaluer le prix que vous avez reçu, il faudrait comparer le prix que nous pourrions vous offrir pour un produit comparable aux spécifications techniques du produit comfortmaker. Un représentant de notre compagnie vous contactera par courriel.

Pascal C:
16/03/2019, 09:06:58 AM
Reply

Bonjour, j’ai une thermopompe coleman de 2 ans. Elle a arrêté de fonctionner cet hiver. Un technicien vient de venir et il me dit que malgré la garantie qui couvre les pièces, il faut remplacer le serpentin au complet. Seulement en temps et en gaz ça va coûter autour de 900$. Il dit que ça été ecrasé mais personne n’a touché à la machine. Bref, pensez-vous que c’est un prix raisonnable? Merci

Thermopompe N & R Sol:
18/03/2019, 10:53:55 AM

Bonjour. Nous soupçonnons que votre serpentin à gelé et à été écrasé par la glace. N'ayant pas le modèle de votre thermopompe, nous ne pouvons évaluer la quantité de gaz requis, ce qui influence grandement le coût de réparation. Toutefois, même sans connaître la quantité de gaz, l'estimé nous semble un peu élevé. Nous évaluons le travail entre 600$ et 700$ (taxes comprises) selon que vous ayez besoin de 10 ou 15 livres de réfrigérant.

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