What are the main factors that contribute to a real estate property's value?
The main factors that contribute to the value of a real estate property value may vary somewhat from location to location based on factors such as culture. Additionally, the effect of each factor may vary over time. Some of the most significant factors include:

1. Location. One of the largest factors is location. The value of a given location will be impacted by many variables such as employment opportunities, local resources such as shopping centers or schools, crime rates, etc.

2. The size of the home. This is commonly measured in square footage. The price per square foot can vary widely between locations.

3. The condition of the home. The age of the home, as well as any damage that has accrued, will typically decrease the property value. A home that is well maintained may limit this decrease in value.

4. External factors such as the state of the economy, interest rates, and the local housing market.

A property's value can be estimated using neighborhood comparables, or comps. That is, finding a property with similar characteristics, such as those listed above, that has been sold recently. The sale price of a recently sold property that is extremely similar to the property of interest will be a strong indicator of the property value. The more similar the property, and the more recently the property was sold, the better the indication will be.
I don't see any factor regarding the energy efficiency and insolation of the house, is it irrelevant to the price?